Filets de Soles Nelson

Ingredients

Equipment Needed

• •30 cm / 12-inch lidded sauté pan
• •2.5 cm / 1-inch Parisienne scoop or melon baller
• •Two 1.5 litre / 1½-quart saucepans
• •35 cm / 14-inch broiler-safe oval platter
• •Fine-mesh sieve
• •Instant-read thermometer

Instructions

1. 1

   Shape the potatoes

   Use a 1-inch Parisienne scoop or melon baller to cut 24 to 28 neat balls from the peeled potatoes. Keep them in cold water while you work so their surfaces don't discolor. Save the trimmings for soup or a purée; waste is not part of the classical canon. Rinse the finished balls until the water runs clear, then leave them submerged until the butter is ready.

   Turn the potato against the scoop rather than digging straight down. A smooth circular motion gives rounder balls and wastes less flesh.
2. 2

   Brown the potato balls

   Melt 5 tablespoons of the butter gently in a wide skillet. Skim away the foam and pour the clear butterfat into a clean pan, leaving the milky sediment behind. Dry the potato balls thoroughly, add them in one layer with ¼ teaspoon of the salt, and cook over medium-low heat for 18 to 24 minutes, turning often, until a knife enters the centres without resistance and every side is light brown. If they color before they soften, lower the heat and cover the pan briefly. If the butter darkens, move the potatoes into a clean pan with the remaining clear butterfat. Hold them off the heat and rewarm them just before serving.

3. 3

   Build the white-wine sauce

   Combine the wine with 1 cup of the fish fumet in a small saucepan and boil steadily until reduced to about ¾ cup. In a second saucepan, melt 2 tablespoons of butter without coloring it, stir in the flour, and cook for 2 minutes to make a roux blanc, a white roux. Whisk in the hot reduction gradually, making each addition smooth before adding the next, then whisk in the cream. Simmer gently for 4 to 5 minutes, whisking, until the sauce is nappant and leaves a clear trail when you draw a finger across the coated back of a spoon. If lumps form, take the pan off the heat, whisk firmly, and pass the sauce through a fine sieve. Keep it covered and barely warm.

4. 4

   Poach the milt

   Examine the milt and remove any loose blood vessels without piercing the enclosing membranes. Bring 1 cup of the fish fumet to the barest tremble in a small pan, season with a pinch of salt, and slide in the milt. Cover with a round of parchment and poach gently for 6 to 10 minutes, depending on thickness, until opaque, delicately firm, and at least 145°F / 63°C at the centre. Boiling makes milt grainy and can burst the membranes. If one splits, don't stir the pan; lift the pieces carefully with a slotted spoon. Hold the milt in a few spoonfuls of its liquor.

5. 5

   Fold and poach sole

   Set an oven rack about 6 inches below the broiler and heat the broiler fully. Pat the sole dry, season with the remaining salt and the white pepper, then fold each fillet into three: bring the thin tail inward and fold the thicker end over it, keeping the former skin side inside. Butter a 12-inch sauté pan with 1 tablespoon of butter and arrange the fillets seam-side down in one layer. Add the remaining 1½ cups fish fumet, cover the fish closely with parchment, and bring the liquid just to a tremble. Lower the heat and poach for 5 to 8 minutes, until the folds are barely opaque and register about 140°F / 60°C; the glaze will finish them. Transfer the fillets carefully to a warm, broiler-safe oval platter and strain the poaching liquor.

6. 6

   Finish the sauce

   Return the white-wine sauce to gentle heat and whisk in ½ cup of the strained sole poaching liquor. Simmer until the sauce returns to a nappant consistency, tasting only now for salt because the fumet has concentrated. Take the pan off the heat and monter au beurre, whisk in the remaining 2 tablespoons of cold butter a little at a time until the sauce gleams. Don't boil it after the butter goes in. If the sauce turns greasy, put 1 tablespoon of cool fumet in a clean pan and whisk in the broken sauce one spoonful at a time. Ça se rattrape.

7. 7

   Glaze and garnish

   Arrange the folded fillets in a close circle on the platter and spoon over enough white-wine sauce to cover each one completely. If the coating slides away and exposes the fish, stop and return the sauce to the pan for another 30 seconds of reduction. Set the platter beneath the fully heated broiler and watch without looking away, glazing for 20 to 45 seconds, just until the sauce swells and catches tiny pale-gold freckles. This is a finish, not a second cooking. Rewarm the potato balls and milt, stack the potatoes into a generous pyramid at the centre, and arrange the well-drained milt around the fillets. Serve the remaining sauce separately. À table!

   The platter must be broiler-safe and already warm. A cold dish delays the glaze, which leaves the sole beneath it cooking while everyone waits for color.

Chef Tips

• •Dover sole has the fine grain and flexibility this folding method expects. If it isn't available, small lemon sole or flounder fillets will fold and poach cleanly, though their flesh is softer and their flavor less sweet.
• •Order milt from a trusted fishmonger and say plainly that it is for eating raw-to-cooked, not bait. Cod milt is the most identifiable home-market equivalent. If none can be sourced, omit it rather than pretending shrimp or ordinary roe is the same garnish; the dish will retain its sauce and potato arrangement, but not the complete Nelson composition.
• •Fish fumet must taste clean and lightly concentrated, never aggressively fishy. If using a good unsalted commercial fish stock, reduce it by one-quarter before measuring, then cool and taste it before adding salt anywhere else.
• •Choose waxy potatoes of similar size. Floury potatoes tend to crack under the scoop and fray in the butter, while waxy flesh holds the precise round shape the centre garnish needs.
• •Use a dry, restrained white wine in the sauce and pour the same style at the table. Chablis or a lean Mâcon works beautifully with the cream, fumet, and delicate sweetness of sole.

Advance Preparation

• •The fish fumet can be prepared up to 2 days ahead, chilled quickly, and kept covered in the cold. It may also be frozen in measured portions.
• •Shape the potato balls up to 4 hours ahead and keep them submerged in cold water. Drain and dry them thoroughly before they meet the clarified butter.
• •The wine and fumet reduction can be made earlier in the day. Finish the roux-bound sauce, poach the sole and milt, and perform the glaze close to serving; delicate fish gains nothing from waiting.

Frequently Asked Questions

Nutrition Information

1 serving (about 500g)