Chef Juliette
Purée de Carottes, otherwise Crécy
Purée de Carottes, otherwise Crécy, turns carrots, butter, rice, and white consommé into a silken soup. The lesson is simple and absolute: blend for smoothness, then sieve for finesse.
Culinary Explorer
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Soupe aux Rognons
Created by Chef Juliette
Based on No. 752, Soupe aux Rognons, from Le Guide Culinaire (1907) by Auguste Escoffier
A brown roux gives this warming soup its body, briskly butter-seared kidney gives it character, and Madeira gives the final perfume. The lesson is timing: garnish at the last possible moment.
Soups & Stews
French
Comfort Food
Budget Friendly
25 min
Active Time
1 hr cook•1 hr 25 min total
YieldAbout 2 quarts (8 cups / 1.9 liters), 8 servings
Soupe aux Rognons (kidney soup) teaches the discipline of keeping garnish and foundation apart until each is ready. The foundation is a roux brun (brown roux) loosened with good stock and simmered until smooth; the kidney is briskly tossed in butter and added only at service. Know one thing before you touch the pan: the kidney waits until the end.
The brigade formula assumed a stockpot never off the fire, a saucier tending the roux, a fine tamis, and enough service to justify separate holding pans. At home, use good unsalted stock, one heavy saucepan, a fine-mesh sieve, and a skillet for the last-minute garnish. I have brought the yield down to about two quarts; what changed is the volume, the stock source, and the sieve. The extra holding pans are scaffolding. The roux brun, separate kidney sear, and Madeira finish are the dish.
The finished soup should be chestnut-brown and lightly bound, with tender pieces of kidney under a glossy surface and Madeira rising at the first spoonful. Dry the kidney thoroughly and sear it in uncrowded batches; that last-minute toss in butter decides the dish.
Soupe aux rognons belongs to the Parisian classical dining room rather than a single provincial larder, drawing on the bourgeois table's practical affection for carefully prepared offal. Classical service transformed that thrift into precision: a roux-bound soup was held ready, while the kidney was cooked to order and Madeira added at the final moment. Despite its name, the kidney is not boiled into the broth; it remains a tender garnish, which is why the brisk toss in butter matters.
The technique, the tradition, and the story behind every dish.
Discover Culinary ExplorerIngredients
unsalted butter for the roux
Quantity
6 tablespoons (90 ml / 85 g)
all-purpose flour
Quantity
2/3 cup (160 ml / 80 g)
good-quality unsalted veal or beef stock
Quantity
8 1/2 cups (2 liters / 2 kilograms)
cool or at room temperature
calf's kidney or sheep's kidneys
Quantity
1 small calf's kidney or 4 sheep's kidneys, about 1 pound (454 g) before trimming
membrane and white core removed, cut into large dice or thick slices
unsalted butter for searing
Quantity
2 tablespoons (30 ml / 28 g)
medium-dry Madeira
Quantity
1/3 cup (80 ml / 80 g)
fine salt
Quantity
Up to 1 1/2 teaspoons (7.5 ml / 9 g)
freshly ground white pepper
Quantity
1/4 teaspoon (1.25 ml / 0.5 g)
| Ingredient | Quantity |
|---|---|
| unsalted butter for the roux | 6 tablespoons (90 ml / 85 g) |
| all-purpose flour | 2/3 cup (160 ml / 80 g) |
| good-quality unsalted veal or beef stockcool or at room temperature | 8 1/2 cups (2 liters / 2 kilograms) |
| calf's kidney or sheep's kidneysmembrane and white core removed, cut into large dice or thick slices | 1 small calf's kidney or 4 sheep's kidneys, about 1 pound (454 g) before trimming |
| unsalted butter for searing | 2 tablespoons (30 ml / 28 g) |
| medium-dry Madeira | 1/3 cup (80 ml / 80 g) |
| fine salt | Up to 1 1/2 teaspoons (7.5 ml / 9 g) |
| freshly ground white pepper | 1/4 teaspoon (1.25 ml / 0.5 g) |
Equipment Needed
- •4-quart heavy saucepan
- •12-inch heavy skillet
- •Fine-mesh sieve
- •Sturdy whisk
- •Instant-read thermometer
Instructions
- 1
Trim and dry kidneys
Pull away the thin outer membrane from the kidney, separate the lobes if using calf's kidney, and cut out every firm white tube and piece of central fat. Cut the cleaned kidney into large dice about 3/4 inch (2 cm) across, or into thick slices. Blot it very dry and keep it chilled while the soup is made. Moisture prevents browning, while the white core remains tough however carefully you cook it.
Fresh kidney smells clean and mineral, not sharply ammoniacal. Trimming corrects texture, but it cannot repair poor freshness; return a kidney with an aggressive ammonia smell. - 2
Cook the roux brun
Melt the 6 tablespoons of butter in a heavy saucepan over medium-low heat. Whisk in the flour, then cook for 15 to 20 minutes, stirring steadily across the floor and corners, until the roux is evenly chestnut-brown and smells of toasted hazelnuts. Patience is the soup here. A pale roux leaves a raw, floury taste; if you see black flecks or smell bitterness, begin again, because scorched flour cannot be hidden under stock or Madeira.
- 3
Moisten without lumps
Take the saucepan off the heat. Reserve 1 cup of the stock, then whisk about 1 cup into the roux a little at a time, making a completely smooth, loose paste before adding the remaining stock in a steady stream. The roux may seize at first. Keep whisking. If lumps form, do not pour it out. Ça se rattrape: whisk vigorously off the heat or blend briefly with an immersion blender, then rely on the final straining to catch anything stubborn.
Adding the first stock gradually is what keeps the roux smooth. Once that initial paste is even, the remaining liquid can go in much more quickly. - 4
Simmer and strain
Return the saucepan to medium heat and bring the soup slowly to a bare simmer, whisking along the floor until it begins to thicken. Lower the heat and simmer gently for 35 minutes, stirring occasionally and skimming away surface foam. The finished base should lightly coat the back of a spoon and taste of stock and toasted roux, never raw flour. Pass it through a fine-mesh sieve into a clean saucepan, adjust the consistency with as much reserved stock as needed, and season cautiously with salt and white pepper. Hold it at the gentlest simmer.
- 5
Sear the kidney briskly
Heat a wide skillet over medium-high heat and add the remaining 2 tablespoons of butter. When the foam subsides, add the kidney in two uncrowded batches and toss briskly until bronzed outside and just cooked through, about 3 to 4 minutes for dice or 45 to 60 seconds per side for slices. The center of the thickest piece should reach 160°F (71°C). Season only after searing. If the pan fills with grey liquid, lift the kidney out immediately, pour away the liquid, wipe and reheat the pan, then finish in smaller batches with a little of the remaining butter. Ça se rattrape.
Do not simmer the seared kidney in the soup. Prolonged cooking makes it firm and sends its mineral flavor through the whole pot. - 6
Finish with Madeira
Take the soup off the heat and stir in the Madeira. Taste once more for salt and white pepper, but do not boil after adding the wine or its perfume disappears. Divide the butter-seared kidney among warmed bowls, pour the soup over it, and serve at once. The kidney stays tender, the roux gives quiet body, and the Madeira arrives last. À table!
Chef Tips
- •Calf's kidney is broad, lobed, and relatively mild; sheep's kidneys are smaller, firmer, and more assertive. Both belong in the source preparation. What matters most is freshness, thorough trimming, and a very dry surface before searing.
- •Use an unsalted stock with a clean beef or veal flavor. A heavily salted carton becomes punishing as the soup simmers, while a weak stock leaves the roux carrying more weight than it should.
- •Do not add cream. This soup gets its body from the roux brun, and cream would soften the precise contrast between toasted stock, kidney, and Madeira.
- •Choose medium-dry Madeira rather than salted cooking wine. It should smell of toasted nuts and dried fruit, and it goes into the soup off the heat so those aromas reach the table.
Advance Preparation
- •The strained soup base can be prepared through step 4 up to 48 hours ahead. Cool it promptly, cover and chill, then return it to a bare simmer before finishing with freshly seared kidney and Madeira.
- •The kidney can be trimmed and cut up to 4 hours ahead, then kept covered and chilled between clean towels. Do not sear it ahead; that final brisk cooking is the dish, not brigade scaffolding.
- •Freeze the strained base without the kidney or Madeira for up to 1 month. Thaw and whisk it over gentle heat, loosening with stock if necessary, then complete the final two steps.
Frequently Asked Questions
Nutrition Information
1 serving (about 240g)
Calories
210 calories
Total Fat
14 g
Saturated Fat
8 g
Trans Fat
0 g
Unsaturated Fat
4 g
Cholesterol
220 mg
Sodium
620 mg
Total Carbohydrates
9 g
Dietary Fiber
0 g
Sugars
1 g
Protein
11 g
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