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Caper Sauce

Caper Sauce

Created by Chef Juliette

Sauce aux Câpres turns finished Butter Sauce (No. 66) into the classical companion for gently boiled fish, with whole capers for brightness and one inviolable rule: keep the bound sauce below a boil.

Sauces & Condiments
French
Comfort Food
Weeknight
5 min
Active Time
10 min cook15 min total
YieldAbout 2 quarts

Sauce aux Câpres (caper sauce) teaches the discipline behind every sauce held by a liaison (an egg-and-butter binding): once it is smooth, gentle heat keeps it smooth. The capers bring sharp, briny points through the rich, lemon-touched base, but the one true thing to know before touching a pan is this: the capers are not the danger. Boiling is.

The book's kitchen assumed a saucier with Butter Sauce (No. 66) ready in quantity, then measured capers into each pint at service. It called for no stock and no salamander, so the home version invents neither; a heavy saucepan and a low burner handle about two quarts, with the exact ratio preserved as eight tablespoons of capers. The brigade's continuous holding and last-minute portioning are scaffolding and can go, while the caper ratio and no-boil discipline are the dish and must stay. One cook, one stove, one evening.

Any tammy work belongs to the preparation of Butter Sauce (No. 66), not this derivative; here a fine-mesh sieve waits only for rescue. Fold in the capers and the sauce stays ivory-gold, glossy with butter, and generous enough to pool around a piece of gently cooked fish. Holding it just below a boil after the capers enter is the step that decides the result.

Sauce aux Câpres belongs to the Parisian classical sauce repertoire, where derivatives allowed one finished base to serve several dishes without sending the saucier back to the beginning. It traveled from grand kitchens to bourgeois tables as a familiar companion to gently boiled fish, its capers cutting through the richness without changing the sauce's smooth body. It is often mistaken for melted butter sharpened with capers, but this formula is specifically Butter Sauce (No. 66) finished with two spoonfuls of capers to each pint.

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Ingredients

Butter Sauce

Quantity

8 cups (1.9 L / approximately 1.9 kg) Butter Sauce (No. 66)

warm and freshly finished

brined capers

Quantity

8 tablespoons (½ cup / 120 ml / 70 g)

drained

cold water (optional)

Quantity

1 tablespoon (15 ml / 15 g)

for rescuing the sauce if needed

Equipment Needed

  • 3-quart heavy-bottomed saucepan
  • Heatproof flexible spatula
  • Fine-mesh sieve for rescue
  • Instant-read thermometer, optional

Instructions

  1. 1

    Ready the capers

    Drain the capers well and taste one. If it is aggressively vinegared, rinse the capers briefly under cold water and dry them; otherwise leave their seasoning intact. Keep them whole so each spoonful of sauce carries distinct little bursts of acidity rather than a muddy, chopped saltiness.

  2. 2

    Warm the base gently

    Set the freshly finished Butter Sauce (No. 66) in a 3-quart heavy-bottomed saucepan over the lowest heat. Stir slowly with a flexible spatula until it flows smoothly and reaches roughly 65 to 70°C (150 to 160°F). It should gleam and loosen without bubbling; if bubbles appear at the edge, lift the pan from the burner at once.

    Without a thermometer, judge by the pan: the sauce should feel hot and fluid, but the surface must remain quiet. A simmer is already too much.
  3. 3

    Fold in capers

    Add all eight tablespoons of capers to the eight cups of sauce, preserving the book's exact proportion of two tablespoons per pint. Fold gently for one to two minutes, just until the capers are hot and evenly carried through the sauce. Do not reduce it. The finished base already has its proper body, and extra cooking only threatens the liaison.

  4. 4

    Hold and rescue

    If the fish needs a few more minutes, hold the sauce in a bain-marie (warm-water bath), never over direct heat. If the surface turns grainy or beads of butter gather around the rim, remove it from the heat immediately. Ça se rattrape: put the cold water in a clean bowl, whisk in one ladleful of sauce until smooth, then whisk in the remainder gradually. If visible yolk curds remain, pass the rescued sauce through a fine-mesh sieve and keep it over the warm-water bath.

  5. 5

    Sauce the fish

    Taste before serving, remembering that capers vary greatly in salt and acidity. Spoon the Sauce aux Câpres generously over gently boiled or poached fish just before it reaches the table, letting the sauce pool around the flesh rather than hiding it completely. Serve at once. À table!

Chef Tips

  • Choose small brined capers that remain firm. Salt-packed capers also work, but soak and taste them before measuring; their salt must be removed without washing away every trace of character.
  • Cod, haddock, hake, halibut, and skate all welcome this sauce. Cook the fish gently, because a hard boil roughens the flesh while the sauce asks for clean flakes and a quiet surface.
  • Use freshly finished Butter Sauce (No. 66). Repeated chilling and reheating make its liaison fragile, while twenty minutes in a warm-water bath keeps it smooth without bullying it.

Advance Preparation

  • The capers can be drained, measured, covered, and refrigerated up to one day ahead. Bring them out while the base is being finished so they do not cool the sauce sharply.
  • Prepare Butter Sauce (No. 66) shortly before service, then complete the derivative in ten minutes. Finished Sauce aux Câpres may wait for up to twenty minutes in a warm-water bath, but it should not be allowed to simmer or repeatedly reheated.

Frequently Asked Questions

Nutrition Information

1 serving (about 62g)

Calories
140 calories
Total Fat
14 g
Saturated Fat
9 g
Trans Fat
0 g
Unsaturated Fat
4 g
Cholesterol
40 mg
Sodium
400 mg
Total Carbohydrates
3 g
Dietary Fiber
0 g
Sugars
0 g
Protein
1 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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