The Crimping of Fish

Ingredients

Equipment Needed

• •Large nonreactive bowl, at least 4 quarts (3.8 liters)
• •Wide 6 to 8-quart (5.7 to 7.6-liter) pot with lid
• •Broad perforated fish spatula or skimmer
• •Instant-read thermometer
• •Small heavy saucepan and whisk
• •Warm oval serving platter
• •Two small sauceboats or heatproof jugs

Instructions

1. 1

   Crimp the steaks

   Arrange the freshly cut salmon steaks in one layer in a nonreactive bowl. Add the very cold water and enough ice to hold the bath below 40°F (4°C), then refrigerate for 1 hour. The flesh should tighten, the cut edges should draw inward, and the skin may curl slightly. Keep every piece submerged. If the bath warms, replace the melting ice immediately; if the fish shows no contraction after an hour, do not soak it longer because it will only become waterlogged. Drain it and continue as boiled salmon, knowing that true crimping required fresher fish.

   Ask the fishmonger directly whether the fish can be cut immediately after humane dispatch. Fish that has already stiffened, softened again, or been frozen can still be boiled well, but it cannot reproduce the muscular contraction that defines crimping.
2. 2

   Prepare salted water

   While the fish completes its soak, combine the cooking water and sea salt in a wide 6 to 8-quart (5.7 to 7.6-liter) pot that can hold the steaks in one layer. Bring it to a full boil. Warm the serving platter and two sauceboats with hot water, then dry them thoroughly just before serving. Drain the salmon and discard every drop of the raw soaking water.

3. 3

   Stop at doneness

   Lower the cold steaks into the boiling salted water with a broad perforated spatula. Cover only until the water returns to a boil, then uncover and reduce the heat enough to maintain quiet, steady bubbling rather than a violent roll. Begin checking after 6 minutes by inserting an instant-read thermometer sideways into the thickest flesh beside the bone. Lift each steak separately the instant it reaches 145°F (63°C), usually after 7 to 10 minutes. The flesh should be opaque at the bone and separate into moist, firm flakes. If the water begins rolling hard enough to split the fish, pull the pot off the heat at once and finish in the hot liquor off the flame, checking every 30 seconds.

   The clock is only a warning bell. Thickness, bone, and the cold soak all alter the timing, so test every steak and remove it when ready rather than sacrificing the thinner pieces to the thickest one.
4. 4

   Mount the butter

   Transfer the salmon to the warm platter and cover it loosely. Ladle 1 cup (240 ml) of clear cooking liquor into one warm sauceboat. Put another 3 tablespoons (45 ml) of the liquor in a small saucepan and bring it just to a simmer, then lower the heat completely. Whisk in the cold butter a few cubes at a time, allowing each addition to melt almost fully before adding the next. Keep the beurre monté warm beside the heat but never let it boil. If it separates into yellow fat and watery streaks, stop. Ça se rattrape: put the optional tablespoon of cold water in a clean pan and whisk the broken sauce into it one spoonful at a time until the emulsion returns.

5. 5

   Serve sauce and liquor

   Spoon enough beurre monté over the salmon to give each steak a generous gloss, then pour the remainder into the second warm sauceboat. Bring both boats to the table, the butter for richness and the clear fish liquor for spooning around the flesh exactly as the source directs. Serve immediately while the flakes remain moist and cleanly set. À table!

Chef Tips

• •The fish must be dead before it is cut. Crimping depends on pre-rigor flesh, not on cruelty, so ask for humane dispatch and immediate cutting rather than attempting to handle a living fish at home.
• •For the whole-fish form, make deep lateral gashes on both sides every 1½ to 2 inches (4 to 5 cm), soak the fish in very cold water for about an hour, and boil it in a vessel large enough to submerge it. For four people, the source's sliced method preserves the intent and avoids buying a dedicated fish kettle.
• •Fresh cod and haddock can replace salmon in equally thick bone-in steaks. Skate must be skinned on both sides and divided into four large pieces before soaking; begin checking it earlier because thin wing sections cook quickly.
• •This dish waits for nobody. Have the platter, sauceboats, butter, thermometer, and guests ready before the salmon enters the water, then serve the moment the beurre monté is finished.
• •Pour a dry white wine with firm acidity and little oak. The fish and butter need freshness in the glass, not perfume or sweetness.

Advance Preparation

• •Have the salmon cut on the day of cooking and begin the icy soak about 75 minutes before you plan to boil it. Do not crimp the fish hours ahead; prolonged soaking trades firmness for waterlogging.
• •Cube the butter and keep it cold until the final minutes. Set out the pot, thermometer, platter, and sauceboats before the fish leaves its bath.
• •The fish cannot be boiled ahead without losing the precise texture the method exists to create. Any leftovers should be chilled promptly and eaten cold within 1 day.

Frequently Asked Questions

Nutrition Information

1 serving (about 205g)