How To Fillet Monkfish: A Complete Step by Step Guide
Monkfish in the Ocean

Monkfish is the right fish to end a shellfish series on, because it barely behaves like a fish at all. It does not flake. It has no pin bones, no rib cage, and nothing to fillet in the usual sense. Cut into medallions and seared hard, it eats closer to lobster tail than to cod, which is where the old nickname poor man's lobster came from, back when monkfish was cheap. It is not cheap anymore.

The butchery is unlike every other page in this series. There is no riding the backbone, because the tail has a single cartilaginous spine and the two fillets simply lift away from it. A confident cook can bone a monkfish tail in three minutes.

The cleaning is another matter entirely, and it is where nearly everyone fails. Monkfish is wrapped in successive layers of tough membrane, and every layer you leave behind contracts violently in the pan, curling your medallion into a tight rubbery knot and making the fish chewy. Ninety percent of the work on this page is membrane. Get that right and monkfish is one of the most impressive things you can put on a plate.

Table of Contents

 

What Monkfish Is and How to Buy It

Monkfish is an anglerfish, also sold as goosefish. It is a bottom dweller with an enormous flattened head, a cavernous mouth, and a modified dorsal spine it dangles in front of that mouth as a lure. It is a genuinely startling looking animal, which is exactly why you almost never see one whole.

The two species that dominate the market, one in the Northwest Atlantic and one in European waters, are close enough in the kitchen that the handling is identical. What varies far more than species is how much cleaning the vendor has already done, and that is the thing to ask about.

Why You Only Ever See the Tail

The head accounts for an enormous share of the whole animal, and there is very little eating on it. Boats routinely remove it at sea, so what reaches the counter is the tail, and the tail is the product.

This has a practical consequence when you shop. A monkfish tail is already a heavily processed cut, and the price reflects work done or not done. A tail sold skin-on with all membranes intact is cheaper and gives you an hour of work. A fully cleaned, membrane-free fillet costs considerably more per pound and is often worth it, provided you inspect it, because plenty of tails sold as cleaned still have a full layer of silverskin on them.

Judging a Monkfish Tail

  • Color. Off-white to pale pink and translucent-looking. Grey, yellowing, or chalky white means age.
  • Firmness. Monkfish should be genuinely hard to the press, firmer than any other white fish at the counter. Softness is the first sign it is going.
  • No pooled liquid. A tail sitting in a puddle has been thawed or held too long.
  • Smell. Clean and marine. Monkfish holds up well and should smell of almost nothing.
  • Ask what has been removed. Skin off but membrane on is the most common state, and it is the one people mistake for cleaned.
  • Size. Larger tails give thicker medallions and a better ratio of meat to membrane. A very small tail is mostly work.

Ankimo, the Liver Worth Asking For

Monkfish liver is one of the great overlooked ingredients in Western kitchens and one of the most prized in Japan, where it is called ankimo and treated as a delicacy in the same conversation as foie gras. It is rich, dense, and mild, traditionally cleaned of veins, rolled, steamed, chilled, and sliced.

In the United States it is usually removed and discarded before the fish reaches retail, which means you will not find it unless you ask. If you have a fishmonger who handles whole monkfish, ask them to save you the liver. It costs almost nothing, it is not on any display case, and the answer is often yes.

Handle it like any organ meat. It is highly perishable and wants using within a day.

Equipment Required

The knife requirements here are the opposite of the grouper page. You are not crossing a deep body. You are peeling membrane off a curved surface without gouging the meat underneath, and that is a job for a thin, flexible, long blade.

Safety and Handling

The good news first. Monkfish carries none of the specific hazards that dominate the other pages in this series. There is no ciguatera concern as with reef predators, no scombroid histamine issue as with tuna, and no filter-feeding pathogen risk as with oysters. It is a low-drama fish from a safety standpoint and generally sits among the lower-mercury choices, though as always current FDA and EPA advisories are the place to check rather than any article.

Fish, not shellfish. Despite the lobster comparison, monkfish is a finfish. Someone with a shellfish allergy, whether to crustaceans or mollusks, is not reacting to the same proteins. Finfish allergy is its own separate category. The nickname describes texture, nothing more, and it is worth saying that out loud to a guest who avoids shellfish and might otherwise be alarmed by the plate.

Seafood is regulated by the FDA in the United States, not the USDA. USDA inspection covers meat, poultry, and eggs. Any seafood handling guidance citing USDA standards is coming from a source that does not know the subject.

Knife safety matters more here than on most fish. Membrane work involves long slicing strokes with a flexible blade on a slippery surface, often with your other hand pulling in the opposite direction under tension. Keep the pulling hand behind the blade path, never toward it. If the membrane tears suddenly and your hand travels, you want it traveling away from the edge.

Cold and dry. Keep the tail refrigerated until you cut. A cold, dry surface grips better and cuts cleaner than a warm wet one.

Anatomy: The Simplest Skeleton in the Series

Anatomy: The Simplest Skeleton in the Series Monkfish

Monkfish anatomy is almost aggressively simple, which is why the butchery is easy and the cleaning is not.

One central spine. The tail contains a single cartilaginous spine running down the center. Cartilage, not hard bone, which is why a knife passes along it so easily. Two fillets sit either side of it.

No pin bones. No rib cage. None. There is nothing to tweeze and nothing to cut around. Any guide that tells you to check monkfish for pin bones is describing a fish that does not exist.

Skin, then membrane, then more membrane. The outer skin is thick, rubbery, and inedible. Beneath it lie multiple successive layers of tough connective tissue, and this is the part people underestimate. It is not one silverskin. Peel one layer and you will frequently find another beneath it, sometimes a third.

Muscle in one direction. The flesh runs in long parallel fibers with no flake structure at all. This is why it slices into clean medallions that hold together, and why it goes rubbery rather than dry when it is mishandled.

Cheeks and liver. Both live in the head, which is why you rarely see either. Both are excellent and both require a fishmonger who handles whole fish.

Step by Step Butchery

Step 1: Skin the Tail

Most tails arrive skinned. If yours has not been, work a fingertip or the knife tip under the skin at the thick end to lift a flap. Grip that flap with a paper towel for purchase and pull it back toward the tail, keeping the blade angled against the skin and taking only what does not come free by hand.

Monkfish skin is tough enough to take a hard pull without tearing. It often comes off in one piece, like removing a sleeve. Discard it.

Step 2: Take the Fillets Off the Spine

Lay the tail flat. Run the tip of your knife down one side of the central spine to open the meat, then lay the blade flat against the cartilage and sweep down the length, keeping constant contact.

The fillet lifts away in one piece with almost no resistance. Turn the tail and repeat on the other side. You now have two long fillets and a spine that goes in the stockpot.

This is the whole of the butchery. It takes about three minutes and it is the easiest boning job of any fish in this series. Everything from here is cleaning.

Step 3: The First Membrane

Lay a fillet with the membrane side up. You will see a grey-pink translucent sheet clinging to the surface.

At the thick end, slide the tip of a flexible knife under an edge of the membrane to lift a tab about an inch wide. Grip that tab with a paper towel, pull it taut and slightly upward, and lay the blade almost flat against it at a shallow angle.

Now pull the membrane against the blade rather than pushing the knife along the fish. The same principle as skinning a fillet: the knife stays nearly still and steadily angled, and the hand under tension does the work. Done properly the membrane comes away in long strips with no meat attached.

If you are taking meat with it, your angle is too steep. Flatten the blade and try again from a fresh tab.

Step 4: The Membranes Underneath

This is the step everyone skips, and it is the reason most home-cooked monkfish disappoints.

Once the first layer is off, run your fingers over the surface and look at it in good light. If it is still slightly shiny, silvery, or slick rather than matte, there is another layer. Find an edge, lift a tab, and repeat exactly the same technique.

Expect two layers as standard and be unsurprised by three. Keep going until the surface is uniformly matte and the flesh feels tacky to a dry finger rather than slippery. That tackiness is the test.

Every layer left behind shrinks hard in the pan, which curls the medallion into a knot and tightens the meat around it. There is no cooking method that rescues a badly cleaned monkfish, which is why this step is worth the ten minutes it takes.

Step 5: Trim the Tail End and Bloodline

The thin tail end is not worth portioning as medallions. Cut it off and set it aside for a stew, a curry, or fish cakes.

Trim any dark bloodline or discolored patches, and take off any ragged edges so the fillet is an even cylinder. A clean shape is what gives you medallions that all cook at the same rate.

Step 6: Portion

Medallions. Slice the cleaned fillet crosswise into rounds about an inch to an inch and a half thick. This is the presentation that makes people say lobster.

Whole roast. Leave the fillet in one long piece, or leave both fillets on the spine after cleaning and roast the tail bone-in. Bone-in roasting gives you a better result: more flavor, more forgiveness, and easier carving at the table.

Chunks. Two-inch pieces for stews, curries, and anything braised. Monkfish is one of the very few fish that will not disintegrate in a long-cooked dish.

Step 7: Dry and Store

Pat the portions thoroughly dry. Monkfish holds a lot of surface moisture and a wet surface will steam instead of searing.

For the best crust, leave the portions uncovered on a rack in the refrigerator for thirty to sixty minutes before cooking. The same trick used on scallops, and it works for the same reason.

Cleaned monkfish keeps a day or two refrigerated in a covered container and freezes better than most white fish, because the dense muscle structure holds up to it.

Individual Cuts and Yield

Individual Cuts and Yield Monkfish

Monkfish yield is poor and you should know that before you are surprised by the bill. Between skin, multiple membranes, the spine, and the thin tail trim, expect to lose a substantial share of the tail weight you paid for, often something close to half. From a whole animal, once the enormous head is accounted for, the picture is worse still.

This is why a properly cleaned fillet at a higher price per pound is frequently the better buy. You are paying for someone else's forty minutes, and you are paying for meat rather than membrane.

  • Medallions from the thick end. The premium cut. Even, round, dense, and the reason monkfish appears on tasting menus.
  • The whole tail, bone in. The best eating and the least work. Roast it like a small joint of meat.
  • Tail trim. Stews, curries, fish cakes, chowder.
  • The spine. Cartilage rather than bone, and it makes a good clean stock. Rinse it well first.
  • The liver. Ankimo, if you can get it. Ask.
  • Cheeks. In the head, so effectively never available at retail. Worth asking a whole-fish supplier.
  • Skin and membrane. The only true waste. Both are inedible and neither is worth reclaiming.

Cooking Applications

The governing principle: cook monkfish like meat, not like fish. It responds to the techniques you would use on a pork tenderloin or a veal medallion, and it fails under the gentle treatment that suits cod.

Searing medallions. Dry surface, hot heavy pan, hard sear on both faces, then finish with butter and let it rest a minute like a steak. Monkfish rests well, which almost no other fish does.

Roasting whole on the bone. The best thing you can do with a monkfish tail. Season, sear the outside, and roast until done through, then carve at the table. Bone-in keeps it moist and the presentation is genuinely impressive.

Wrapped in cured pork. Prosciutto or pancetta wrapped around a tail before roasting is a classic pairing for a reason. The fat bastes lean flesh and the salt suits the sweetness.

Braises and stews. Monkfish holds its shape in liquid where nearly every other white fish falls apart. It belongs in bouillabaisse-style dishes, curries, and anything tomato-based.

Red wine sauces. Because it eats like meat, it takes red wine reductions that would overwhelm a delicate fish. This is one of the few white fish that can carry that pairing.

Getting doneness right. This matters more with monkfish than with any other fish on this site, because the usual cue is missing. Monkfish does not flake, so you cannot test it the way you test cod.

More importantly, monkfish is worse undercooked than most fish. Where an undercooked piece of salmon is merely rare and pleasant, undercooked monkfish is bouncy and rubbery. Overcooked, it goes tough and dry. The window is narrower than people expect, which is precisely why the thermometer belongs in the equipment list rather than in the nice-to-have column. Cook it through, pull it as soon as it is through, and let it rest.

Ten Mistakes That Ruin Monkfish

  1. Leaving membrane on. The definitive monkfish failure. It curls and toughens in the pan and nothing fixes it after.
  2. Stopping after one membrane layer. There are usually two and sometimes three. Matte surface, tacky to the touch, or keep going.
  3. Pushing the knife instead of pulling the membrane. Blade nearly still and flat, tension in the other hand.
  4. Using a stiff blade for cleaning. It gouges. Flexible and thin, always.
  5. Trusting a tail sold as cleaned. Inspect it. Many still carry a full silverskin layer.
  6. Hunting for pin bones. There are none. One cartilaginous spine and nothing else.
  7. Cooking it like delicate fish. Gentle poaching wastes it. Hard heat, or a long braise.
  8. Serving it underdone. Rare monkfish is rubbery, not luxurious. This fish wants cooking through.
  9. Skipping the drying step. A wet surface steams and you lose the crust that makes the dish.
  10. Throwing out the spine and never asking about the liver. One makes good stock, the other is a delicacy people pay a great deal for.

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Frequently Asked Questions

Why did my monkfish curl up and turn rubbery?
Membrane. You left at least one layer on, and it contracted in the heat and pulled the meat into a knot. Monkfish carries multiple successive layers of tough connective tissue, and peeling one off is rarely enough. Keep going until the surface is matte rather than shiny and feels tacky rather than slippery to a dry finger.

How many membrane layers are there?
Usually two, sometimes three. There is no fixed number, which is why the finish test matters more than counting. Shiny or slick means another layer remains.

Where are the pin bones?
There are none, and this is one of monkfish's great advantages. The tail has a single central cartilaginous spine and two fillets that lift away from it cleanly. Nothing to tweeze, no rib cage, no bones in the portions at all.

Is monkfish really like lobster?
In texture, closer than any other fish. It is dense and firm, it does not flake, and cut into medallions and seared it eats much more like lobster tail than like white fish. The flavor is milder and sweeter than cod but it is its own thing. The nickname comes from a time when monkfish was inexpensive, which is no longer true.

Can someone with a shellfish allergy eat monkfish?
Monkfish is a finfish, not a shellfish, so it does not contain crustacean or mollusk proteins. Finfish allergy is a separate category of its own, so this is not a blanket assurance for anyone with multiple food allergies. The lobster nickname describes texture only, and it is worth saying so to a guest who might be alarmed by the plate.

Should I roast it on the bone or cut medallions?
Bone-in is the better eating and less work: more flavor, more forgiveness, and a genuinely impressive thing to carve at the table. Medallions are the better presentation for plated courses. Clean the membrane thoroughly either way, because roasting on the bone does not excuse you from that job.

How do I know when it is done?
Use a thermometer. Monkfish does not flake, so the standard visual test for white fish simply does not apply, and the window is narrower than people expect. Undercooked monkfish is bouncy and rubbery rather than pleasantly rare, and overcooked it goes dry and tough. Cook it through, pull it immediately, and rest it briefly.

What is ankimo?
Monkfish liver, prized in Japan and often compared to foie gras. It is typically cleaned of veins, rolled, steamed, chilled, and sliced. In the United States it is usually discarded before the fish reaches retail, so you have to ask a fishmonger who handles whole monkfish to save it for you. It is highly perishable and should be used within a day.

About Chef Alan

Chef Alan has spent 35 years in professional kitchens and is a 6-Time 4-Diamond Chef, with a formal college culinary education in New Hampshire. The techniques in this guide are the ones used on the line, not the ones that photograph well and fail under pressure.

Cook Bolder, Serve Wiser, Eat Better.

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