P
French
Centrifuged and Clarified Stocks: Restaurant Clarity
Consommé — the classical French clear soup — achieves its crystal clarity through the raft method: a mixture of ground meat, egg whites, and aromatics (the clearmeat) is combined with cold stock, brought to a simmer, and the egg proteins denature and coagulate, forming a raft on the surface that acts as a filter, trapping all particles as the stock is drawn through it. Modernist Cuisine extends this with centrifugation and gelatin filtration.
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I
The Market List
The benchmark for each ingredient, and who stocks it near you. Tap a stockist to go straight to the product.
For the base stock
2 L
cold brown beef or chicken stock
fully defatted and cold
Your own market
For the clearmeat (raft method)
300 g
lean ground beef or chicken
sinew removed
Your own market
4
egg whites
lightly beaten, cold
Your own market
150 g
mirepoix
onion, carrot, celery, finely chopped
Not yet stocked in British Columbia
60 g
1 small bunch
mixed herbs
parsley stalks, thyme, bay leaf
Not yet stocked in British Columbia
For gelatin filtration (modernist method)
2 L
cold stock
same base as above
Not yet stocked in British Columbia
10 g
For centrifugation (modern restaurant method)
2 L
stock
cold, defatted; run at 4,000 rpm for 20–30 minutes
Not yet stocked in British Columbia
Each tap is counted, so the stockist sees the demand Provenance sends them.
II
The Method
1
CLASSICAL RAFT METHOD — Step 1. Combine the cold stock with the clearmeat: ground meat, egg whites, mirepoix, chopped tomato, and herbs. Mix thoroughly while the stock is still cold. Transfer to a wide, heavy saucepan.
2
Step 2. Set the pan over medium heat and stir slowly and continuously from the bottom until the liquid reaches a bare simmer. As the temperature climbs, the egg proteins begin to denature and rise, binding particles as they go. Stop stirring the moment the raft begins to form at the surface — from this point the liquid below must not be disturbed. The raft is set when it holds its structure as a firm, unified mass across the surface: this is where the dish lives or dies. Any agitation after this point re-suspends particles and destroys the clarity irreversibly.
3
Step 3. Maintain the barest possible simmer — gentle bubbling visible at the edges only — for the duration of cooking, so the stock is drawn upward through the raft filter continuously. Ladle the consommé from below the raft through a fine cloth-lined strainer into a clean vessel. The finished consommé is crystal-clear and free of any suspended particles.
From the canon — The supreme demonstration of classical technique — a perfectly clarified stock, trembling and transparent as amber glass, carrying the concentrated flavour o… Consommé →
4
GELATIN FILTRATION METHOD — Step 1. Bloom the leaf gelatin in cold water, then dissolve it into the hot stock. Cool to room temperature, then freeze solid in a shallow container.
5
GELATIN FILTRATION METHOD — Step 2. Transfer the frozen block to a cloth-lined strainer set over a clean vessel. Allow to thaw slowly at refrigerator temperature. As the gelatin matrix melts, it releases clarified stock first; particles remain bound in the later-thawing gel. The stock is done when the drip runs clear and the gel above still holds its form.
6
CENTRIFUGATION METHOD — Place cold, defatted stock in the centrifuge vessel. Run at 4,000 rpm for 20–30 minutes. All suspended particles pellet to the bottom of the vessel. Decant the clear stock from above without disturbing the pellet. The result is ready when the decanted liquid is visually indistinguishable from water.
III
Quality Hierarchy
01
Reserve — Centrifuged stock produced at 4,000 rpm from a long-cooked, fully defatted restaurant-grade fond: the modernist benchmark for absolute clarity and undiminished flavour.
02
Estate — Gelatin-filtration method using a high-gelatin home stock, frozen and slow-thawed through fine cloth: near-perfect clarity with no loss of aromatics from heat.
03
Market — Classical consommé via a well-made clearmeat raft, correctly held at a bare simmer and ladled with discipline through a fine cloth: the historically definitive result.
04
House — Classical raft method on a lighter or commercial stock: the clarity will be acceptable if the raft is respected, though depth of flavour is reduced.
IV
Sensory Tests
◇Sight. The raft holds as a single, firm, unified mass across the entire surface of the pan without breaking or sinking.
◇Sight. The consommé drawn from below the raft is crystal-clear when held in a white ladle or pale vessel — no cloudiness, no floating particles.
◇Sight. In the gelatin method, the drip through the cloth runs clear before the gel above fully collapses.
◇Sight. In the centrifuge method, the decanted layer above the pellet is visually transparent.
◇Sound. During the raft method, the simmer is audible only as the faintest intermittent bubbling; a rolling boil indicates excessive heat that will break the raft.
◇Where it lives or dies. The raft must form undisturbed: any agitation after coagulation begins re-clouds the stock and no subsequent step can recover the clarity.
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VI
What to Pour
A bone-dry fino or manzanilla sherry, served cold; its saline, oxidative character complements the concentrated savouriness of a clear meat stock without competing with its delicacy. Alternatively, a still mineral water of low carbonation where wine is not appropriate.
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