Stock vs Broth
Stock is a liquid made by simmering bones, often with vegetables and aromatics, for a long time; it is left unseasoned and has a rich, gelatinous body. Broth is made mainly from meat (and sometimes vegetables), is seasoned, cooks for less time, and tastes good enough to sip on its own.
The key differences
| Stock | Broth | |
|---|---|---|
| Main ingredient | Bones, joints, some meat | Meat, sometimes bones |
| Simmer time | Chicken 3–4 h, beef or veal 6–8 h, fish 30–45 min | 1–2 h |
| Seasoning | Little or no salt | Salted to taste |
| Body | Thick, sets to a gel when cold | Thin, stays liquid |
| Best for | Sauces, reductions, risotto, braises | Soups, sipping, cooking grains |
The science of body
Bones, knuckles, wings, feet, and skin are full of collagen, a tough structural protein. Held at a simmer for hours, collagen unwinds and dissolves into gelatin. Gelatin gives stock its silky, lip-sticking feel, and it is why a chilled stock wobbles like jelly.
That body matters most when you reduce stock for a sauce. As water evaporates, gelatin concentrates and the sauce turns glossy and coats a spoon. Reduce a thin broth and you mostly concentrate salt.
Meat, on the other hand, contributes flavour compounds such as amino acids, peptides, and nucleotides that give broth its savoury, umami taste, but relatively little gelatin.
Why stock is unsalted
Stock is a building block. If it were salted and then reduced by half, the salt would double. Leaving it plain lets you season the final dish correctly.
Making either one well
- Start cold. Cover bones with cold water, roughly 1.5–2 L per 1 kg bones, so proteins dissolve and rise gradually as scum you can skim.
- Simmer, don't boil. Keep it at 85–95 °C / 185–203 °F with only an occasional bubble. Boiling makes it cloudy and greasy.
- Skim early. Remove the grey foam of coagulated proteins in the first 30 minutes.
- Add vegetables later. Mirepoix needs about an hour; added at the start of a long beef stock, it can turn mushy and dull.
- Cool fast. Strain, then chill in shallow containers to move it through the danger zone quickly.
Store-bought labels
Commercial products blur the lines. Many "stocks" are thin and salted, and "broths" vary widely. Check sodium on the label and look for low-sodium versions when you plan to reduce. A packet of unflavoured gelatin, about 7 g per litre, can give boxed stock more homemade body.
Vegetable stock
Vegetable stock has no collagen, so it never gels. It is lighter and is best simmered for only 45–60 minutes, as longer cooking can turn vegetables bitter.
Questions
Can I use broth instead of stock?
Yes, in most recipes. Broth is saltier and thinner, so cut back on added salt and expect a slightly less glossy sauce. For reductions and pan sauces, stock works noticeably better.
Is bone broth the same as stock?
Bone broth is essentially stock simmered longer, often 12–24 hours, and usually seasoned so it can be sipped. The long simmer extracts more gelatin and minerals, but the method is the same.
Why does homemade stock turn to jelly in the fridge?
Collagen from bones, joints, and skin converts to gelatin during simmering. Cold gelatin sets into a gel, which is a sign of a rich, full-bodied stock. It melts back to liquid when heated.
Why is my stock cloudy?
It boiled. Vigorous bubbling breaks fat and proteins into tiny particles and emulsifies them into the liquid. Keep stock at a bare simmer, 85–95 °C / 185–203 °F, and skim the foam.