Potage Bagration Maigre

Ingredients

Equipment Needed

• •4-quart heavy saucepan
• •12-inch shallow sauté pan with lid
• •Fine-mesh sieve or chinois
• •Flexible heatproof spatula
• •Instant-read thermometer
• •Immersion blender for liaison rescue
• •2 1/2-quart warmed soupière

Instructions

1. 1

   Poach the sole

   Pour the water into a wide, shallow pan and season it with half the salt. Bring it just below a simmer, with an occasional tremble but no rolling bubbles. Lay in the sole, cover, and poach for 3 to 5 minutes, until opaque and very white. Lift it carefully onto a plate and let it cool for 10 minutes, then cut it into a short julienne, matchstick-like strips. If the warm fish threatens to flake under the knife, chill it briefly and try again; cold sole cuts more cleanly.

   No browning belongs here. The sole should remain pearly white so its delicate strips stay distinct against the ivory soup.
2. 2

   Poach the quenelles

   Return the liquid to the barest tremble and poach the quenelles in two batches so they have room to swell. Cook for 4 to 6 minutes, turning once, until gently firm and cooked through. Lift them out with a slotted spoon. If the first quenelle splits, stop and lower the heat before adding the rest; boiling water tears a delicate forcemeat apart.

3. 3

   Join the veloutés

   Combine the fresh fish velouté with the mushroom velouté prepared by the mushroom method of Velouté Agnès Sorel (No. 671) in a heavy saucepan. Warm slowly, stirring along the bottom, until thoroughly hot but never boiling. Pass the mixture through a fine-mesh sieve into a clean saucepan. The brigade's tammy was useful when several hands were waiting; the sieve gives one cook the same smooth result without ceremony. Do not reduce the soup, because its proportion and consistency are already set.

4. 4

   Temper the liaison

   Whisk the egg yolks with the measured cream until perfectly smooth. While whisking constantly, add about 2 cups of hot velouté in a thin stream, then pour this tempered liaison back into the saucepan. Set it over low heat and stir continuously with a flexible spatula, reaching into every corner, until the soup lightly coats the back of a spoon, about 4 to 6 minutes. Keep it below 170°F (77°C), and do not let it simmer. If the first fine grains appear, pull the pan from the heat, whisk in the reserved chilled cream, blend briefly, and strain again. Ça se rattrape. A liaison that has boiled into firm curds cannot be made pristine, so act at the first sign.

   No thermometer is required if you watch the surface. The soup should grow glossy and slightly fuller without producing a single bubble.
5. 5

   Mount with butter

   Take the saucepan completely off the heat. Monter au beurre means finishing by whisking in cold butter, and this is what gives the potage its final body and gleam. Add the cubes a few at a time, whisking until each addition disappears before adding the next. Taste and correct with the remaining salt and white pepper. Once mounted, keep the soup warm over the gentlest water bath if necessary, but never return it directly to the flame.

6. 6

   Garnish and serve

   Warm the sole julienne, quenelles, and crayfish tails in the poaching liquid for no more than 1 minute, then drain them thoroughly. Arrange all three garnishes in a warmed soupière and pour the finished potage over them. Stir only once and very gently, because the quenelles and sole are delicate. Serve immediately while the surface is glossy and the garnish remains distinct. À table!

Chef Tips

• •The linked Velouté Agnès Sorel (No. 671) supplies the mushroom treatment, not its poultry, chicken, or tongue garnish. For Potage Bagration Maigre, build that mushroom component on fish velouté so the soup remains maigre in the classical sense.
• •Unseasoned frozen crayfish tails are an honest answer when fresh crayfish are unavailable. Thaw them overnight in the refrigerator and dry them well; heavily spiced packaged crawfish would pull this pale soup into another kitchen entirely.
• •Keep the fish velouté slightly thinner than a finished sauce. The mushroom component, yolks, cream, and generous butter all add body, and a foundation that begins too thick produces paste rather than potage.
• •A mineral Chablis has enough acidity for the cream and enough restraint for sole and crayfish. Serve small bowls first, because this is a composed opening course, rich by design and never meant to be thin.

Advance Preparation

• •Prepare the fish velouté and the mushroom component up to two days ahead. Chill them separately in shallow containers, cover once cold, and bring them together only when finishing the soup.
• •The sole and quenelles may be poached earlier on the serving day. Refrigerate them separately and cut the sole into julienne once cold; keep the crayfish chilled until the final warming.
• •Do not make the liaison ahead or hold the mounted soup for a long service. Once yolks and butter enter, allow about 15 minutes to bind, garnish, and serve.

Frequently Asked Questions

Nutrition Information

1 serving (about 250g)