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Sole Cubat

Sole Cubat

Created by Chef Juliette

Based on No. 840, Sole Cubat, from Le Guide Culinaire (1907) by Auguste Escoffier

Sole Cubat teaches the final, fierce minute of a gratin: mushroom-poached sole over mushroom purée, striped with truffle, veiled in Mornay, and gilded before the fish can cook twice.

Main Dishes
French
Dinner Party
Special Occasion
30 min
Active Time
40 min cook1 hr 10 min total
Yield4 servings

Sole Cubat teaches the final, fierce minute of a gratin. The sole is poached before it is dressed, the purée and Mornay are hot, and the broiler has one job: gild the cheese before the fish cooks twice. Glazing is not baking. Know that before touching a pan.

The original formula assumed a saucier on staff, a stock never off the fire, mushroom cooking liquor and purée already waiting, and a salamander overhead. This entry does not use the stock, so the home version does not smuggle it in: one pan of mushrooms gives both the liquor and purée, a small roux becomes Mornay, and a domestic broiler replaces the salamander. The single trimmed sole becomes its four fillets so it fits one shallow dish, while the one-fifth pint of liquor and half-ounce of poaching butter stay intact. That is the brigade scaffolding removed, not the dish rewritten. One cook, one stove, one evening.

The reward is pale, tender sole over an earthy mushroom bed, black truffle caught beneath a glossy ivory sauce, and a top freckled butter-gold. Keep every component hot, set the rack before assembly, and give the finished dish only the swift glaze it needs. That last minute decides Sole Cubat.

Sole Cubat belongs to the named-garnish repertoire of Parisian grand cuisine, where a cook's or patron's name signaled an exact arrangement rather than a regional larder. From formal dining rooms it passed into bourgeois recipe books, but the construction stayed fixed: mushroom purée below, truffle on the sole, Mornay above, then cheese and a quick glaze. It is not a coastal regional specialty; its home is the Paris table, and Cubat names the garnish rather than the fish's place of capture.

The technique, the tradition, and the story behind every dish.

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Ingredients

skinless fillets from 1 large Dover sole

Quantity

4 fillets (1¼ to 1½ pounds / 570 to 680 g total)

small white button mushrooms

Quantity

6 cups sliced (1.4 L / 450 g)

thinly sliced

cold water

Quantity

¾ cup (180 ml / 180 g)

unsalted butter

Quantity

5 tablespoons (75 ml / 70 g)

divided

whole milk

Quantity

1½ cups (360 ml / 370 g)

all-purpose flour

Quantity

¼ cup (60 ml / 30 g)

Gruyère

Quantity

½ cup finely grated (120 ml / 50 g)

divided

Parmesan

Quantity

⅓ cup finely grated (80 ml / 30 g)

divided

fresh black truffle

Quantity

1 small truffle (about ⅓ ounce / 10 g)

cut into 6 broad, fine slices

fine sea salt

Quantity

1¼ teaspoons (6 ml / 7.5 g)

divided

ground white pepper

Quantity

¼ teaspoon (1.25 ml / 0.5 g)

Equipment Needed

  • 30 cm (12-inch) sauté pan with lid
  • 1.9 L (2-quart) shallow broiler-safe gratin dish
  • 1.9 L (2-quart) heavy saucepan
  • Food processor or strong blender
  • Fine-mesh sieve
  • Wide fish spatula

Instructions

  1. 1

    Make mushroom liquor

    Put the sliced mushrooms in a wide pan with the water, 2 tablespoons of the butter, and ½ teaspoon of the salt. Bring to a gentle simmer, cover, and cook for 7 to 9 minutes, stirring once, until the mushrooms have collapsed and released their pale, savory liquor. Strain them through a fine-mesh sieve and reserve exactly ½ cup (120 ml / 120 g) of the cooking liquor. If you have less, add enough water to reach that measure; save any excess for another sauce.

  2. 2

    Finish mushroom purée

    Return the drained mushrooms to the dry pan and cook over medium heat until excess moisture evaporates and a spatula leaves a clean track across the pan. Process them until very smooth, scraping the bowl as needed. The purée must hold a low mound rather than run. If it slumps, return it to the pan and stir over gentle heat for another minute or two. Keep it covered and warm.

  3. 3

    Build the Mornay

    Reserve 2 tablespoons of the milk and warm the remainder. Melt 2 tablespoons of the butter in a heavy saucepan, whisk in the flour, and cook the pale roux for 90 seconds without letting it color. Add the warm milk in several additions, whisking each one smooth before pouring the next. Simmer gently for 4 to 6 minutes, until the sauce reaches nappe, the coating consistency that clings to a spoon while remaining fluid. Take it off the heat and stir in three-quarters of the combined cheeses, ¼ teaspoon of the salt, and the white pepper. If the Mornay turns grainy or gives up beads of fat, remove it from the heat and whisk in the reserved cold milk a teaspoon at a time. Ça se rattrape. Cover the surface and keep it warm.

  4. 4

    Poach the sole

    Set the broiler rack about 6 inches (15 cm) below the heat and preheat the broiler on high. Arrange the sole fillets in one layer in a covered sauté pan, folding very thin tail ends underneath so the fish cooks evenly. Season with the remaining ½ teaspoon salt, pour in the reserved mushroom liquor, and dot the fish with the final tablespoon of butter, cut into small pieces as the original formula directs. Cover and hold at the barest simmer for 4 to 6 minutes, until the flesh is nearly opaque but still moist at the center, about 125 to 130°F (52 to 54°C). The final glaze will finish the cooking.

  5. 5

    Assemble Sole Cubat

    Spread the hot mushroom purée evenly across the bottom of a shallow broiler-safe gratin dish. Lift out the sole with a wide spatula and let each fillet drain for a few seconds on a clean folded towel, since loose poaching liquor would thin the Mornay. Lay the fillets over the purée and arrange the 6 truffle slices lengthwise across the fish, giving each portion one or two. Spoon over the hot Mornay until the sole is completely napped, then scatter the reserved cheese evenly across the surface.

  6. 6

    Glaze and serve

    Slide the dish beneath the broiler immediately and glaze for 2 to 4 minutes, rotating once if the heat is uneven. Glazing is not baking: pull the dish as soon as the Mornay bubbles at the rim and freckles butter-gold across the top, with the fish reaching 145°F (63°C) at its thickest point. If one patch races ahead, rotate the dish rather than leaving the sole under the heat longer. Bring Sole Cubat straight to the table while the sauce still gleams. À table!

Chef Tips

  • Ask the fishmonger to skin and fillet one large Dover sole, keeping the four fillets as even as possible. Gray sole or lemon sole can stand in when Dover sole is unavailable, though the flesh will be softer and must be poached with particular care.
  • Fresh black truffle supplies both perfume and the dark slices the formula requires. When it isn't in season, use a whole preserved black truffle, drained and sliced. Truffle oil cannot replace it; perfume alone is not the garnish.
  • The Mornay should fall from the spoon in a broad ribbon. A thin sauce runs into the mushroom purée, while an over-thick sauce sits like paste and colors poorly. Loosen it with a little reserved milk before assembly if needed.
  • Set the broiler rack and test its heat before the sole enters the poaching pan. Once the fish is cooked, there is no useful holding time. Hot purée, hot sauce, fierce heat, then the table.
  • Pour a restrained white Burgundy or another dry Chardonnay with good acidity. Leftovers keep for one day under refrigeration, but this dish gives its best at once; reheating is harder on the sole than on the sauce.

Advance Preparation

  • The mushroom liquor and purée can be prepared one day ahead. Chill them separately and promptly, then reheat the purée gently before assembling the dish.
  • The Mornay can be made earlier the same day. Press buttered parchment directly against its surface, refrigerate, and reheat over low heat with a spoonful of milk until it flows in a broad ribbon.
  • Grate the cheeses and prepare the gratin dish in advance, but slice the truffle shortly before assembly and poach the sole only when the broiler is ready.

Frequently Asked Questions

Nutrition Information

1 serving (about 375g)

Calories
460 calories
Total Fat
26 g
Saturated Fat
15 g
Trans Fat
1 g
Unsaturated Fat
10 g
Cholesterol
140 mg
Sodium
1070 mg
Total Carbohydrates
15 g
Dietary Fiber
1 g
Sugars
7 g
Protein
43 g

Note: Chef personas and recipes are created with AI assistance. Cook with care: follow safe food-handling practices, check doneness with a thermometer when needed, and adapt for allergies and your kitchen.

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