White, brown, vegetable, and fish stock — the foundation almost every great sauce and soup is built on.
Section 01
Stock versus broth
The distinction is real and useful. Stock is made primarily from bones and is prized for body — the gelatin extracted from connective tissue is what makes it set in the fridge and gives sauces their silky weight. Broth is made primarily from meat and is prized for flavor, seasoned to be drunk on its own.
A good stock should be almost bland when you taste it hot and should wobble like jelly when cold. That gelatin is the point. Flavor gets added later, in whatever you build with it.
White stock uses raw bones — no browning — for a clean, pale, neutral base. Blanch the bones first: cover with cold water, bring to a boil, drain, and rinse. It looks wasteful and it is the difference between a clear stock and a cloudy grey one.
Add cold water, aromatics, and a bouquet garni, bring to a bare simmer, and hold it there. White stock is the base for velouté, for delicate soups, and for any dish where you do not want a roasted color.
Blanch the bones, then rinse them and the pot.
Cover with cold water by about 5 cm. Cold, always — hot water sets proteins and traps cloudiness.
Bring to a bare simmer and skim the grey foam that rises in the first twenty minutes.
Add mirepoix and aromatics after the first hour so they do not disintegrate.
Simmer gently: chicken 3–4 hours, veal 6–8, and never let it boil.
Strain through a fine sieve without pressing the solids, then cool fast.
Brown stock is the same idea with a roasting step in front of it. Roast the bones at 220 °C until deeply browned, roast or sauté the mirepoix, add tomato paste and let it darken, then deglaze the roasting tray and add everything to the pot.
The result is darker, sweeter, and far more complex — the base for espagnole, demi-glace, and every serious meat sauce. It takes longer and rewards it.
Chef's tip
Do not skip deglazing the roasting tray. Half your browning is stuck to that pan, and it dissolves in thirty seconds with a splash of water or wine.
Section 04
Vegetable and fish stock
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Vegetable stock is fast — 45 minutes is plenty, and longer makes it bitter. Onion, carrot, celery, leek, mushroom, and tomato are the reliable core.
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Avoid brassicas (cabbage, broccoli), beets (they dye everything), and too much starch. Mushroom stems and parmesan rinds are excellent additions.
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Fish stock (fumet) is faster still — 20 to 30 minutes, no more, or it turns bitter and glue-like. Use non-oily white fish bones, rinsed well.
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Fish and shellfish shells benefit from a brief sweat in butter before the water goes in.
Section 05
The rules that actually matter
Stock fundamentals
Start with cold water
Proteins dissolve gradually and clarify; hot water sets them into cloud
Never boil
Boiling emulsifies fat into the liquid and turns it cloudy and greasy
Skim early and often
The grey scum is coagulated protein and impurities
Do not salt
Stock gets reduced later; salt would concentrate to inedible
Do not press the solids
Pressing forces fine particles through and clouds the strain
Cool fast
The 5–60 °C range is where bacteria multiply; get through it quickly
Section 06
Storage and freezing
Cool stock quickly — an ice bath, or a shallow tray rather than a deep pot. Refrigerated stock keeps three to four days, and the fat cap that forms on top actually protects it, so leave it until you use it.
Frozen, it keeps six months easily. Freeze in useful portions: an ice cube tray for deglazing splashes, 250 ml containers for weeknight sauces, and a litre or two for soup. Reduce stock to a concentrated glace first and you can store four times as much in the same space.
Chef's tip
Freeze stock flat in zip bags. They stack like books and thaw in minutes instead of hours.
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Save bones, shells, parmesan rinds, and clean vegetable trim in a freezer bag. Stock should cost nothing.
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A roast chicken carcass plus an onion, a carrot, and 3 hours makes better stock than anything in a carton.
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If your stock does not gel in the fridge, you needed more collagen-rich parts: wings, feet, knuckles, necks.
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Never let a stockpot boil while you step out. Set it to the barest simmer and check on it.
Avoid these
Common mistakes
Boiling the stock and producing a cloudy, greasy result.
Salting the stock, then reducing it into something inedible.
Adding vegetables at the start of a long stock so they turn to mush and taste stewed.
Simmering vegetable or fish stock far too long and extracting bitterness.
Pressing the solids in the strainer to get "every last drop."
Leaving hot stock on the counter to cool slowly.
Get your hands dirty
Practice exercises
Make stock from one roast chicken carcass. Refrigerate it overnight and check whether it gels.
Make a small batch of vegetable stock and taste it at 30, 45, and 90 minutes to find where it turns bitter.
Reduce 500 ml of stock to 100 ml. Taste both and note how much more the concentrate can do.
1. Why must stock never be allowed to boil?
Boiling emulsifies fat into the liquid, making it cloudy and greasy
2. Why should stock start with cold water?
Proteins dissolve gradually rather than seizing into cloudiness
3. Why is stock left unsalted?
Salt prevents gelatin extraction
It will be reduced later, concentrating any salt to inedible levels
4. How long should fish stock simmer?
If you remember nothing else
Key takeaways
Takeaways
Stock is about body (gelatin); broth is about flavor.
Cold water in, never boil, skim often, no salt.
Vegetable and fish stocks are fast — long cooking ruins them.
Freeze in portions; reduce to glace to save space.
Cook it
Practice on these recipes
Chicken Noodle Soup
American · Lunch
French Onion Soup
French · Dinner
Mushroom Risotto
Italian · Dinner
Red Lentil Soup
Middle Eastern · Lunch
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Related lessons
Further reading
Auguste Escoffier, Le Guide Culinaire — the classical stock canon.
The On The Fly Kitchen · Updated 2026-07-29