Stocks and Broths: Clarity, Time, and Why You Do Not Salt Them

Boiling makes it cloudy

Boil a stock hard and it turns murky: the violent movement breaks proteins and fat into fine particles and suspends them in the water. Once suspended, they cannot be skimmed back out.

Once it reaches a boil, drop the heat until the surface only trembles — no large bubbles, just the occasional small one, around 85–95°C. For a stock meant to be clear, like Samgyetang or Pho, holding that temperature is essentially the whole job.

Some broths want the opposite. The opaque white bone broths are deliberately boiled hard to emulsify collagen and fat. Decide which you are making first.

Both ends are on this site. The white of Seolleongtang comes from hours of hard boiling, and Bouillabaisse boils hard specifically to drive its olive oil into the broth (emulsions and pan sauces). Ukha does the reverse and removes the possibility: nothing is fried and there is no butter or cream, so a hard boil has nothing to emulsify and can only cloud it. How hard you may boil a broth is decided by whether there is fat in it to emulsify.

Start in cold water

Put bones or meat into cold water and bring them up together. Dropped into boiling water, the surface proteins seize immediately and seal the flavour inside. Coming up slowly, proteins coagulate gradually and the scum rises where you can remove it.

The exception is when you are removing off-flavours: pork and beef bones are cleaner if you boil them once, discard that water, and start again.

Skim early

Grey foam rises just before the boil. It is coagulated protein and blood, and it needs diligent skimming in the first 10–15 minutes. Miss that window and it disperses back into the liquid, which is exactly what makes stock cloudy.

How long each ingredient wants

More time is not automatically better. Every ingredient has a point where it has given up what it has, and past that it gets worse.

• Kombu and seaweed: 20 minutes maximum, never boiled. Boiling brings out sliminess and bitterness. Miyeokguk, Miso Soup.
• Katsuobushi: 1–2 minutes. Add it, kill the heat, strain once it sinks.
• Vegetables: 30–45 minutes. Longer and the sweetness collapses into something earthy.
• Chicken: 1–2 hours. Samgyetang stops earlier, just before the meat falls apart.
• Beef and pork bones: 4 hours or more — collagen needs that long to become gelatin. The broth of Pho is the example.
• Fish bones: 20–30 minutes. Beyond that you get bitterness and a fishy edge. Salmon soups like Lohikeitto especially want it short.

That ceiling forces a dish's structure. Beef bones can buy depth with four hours; fish cannot. So Ukha buys it with a second lot of fish instead — cheap small fish simmered 25 minutes and then thrown away, with the fish you actually eat going in for ten. The discarded fish is closer to a seasoning than an ingredient.

One dish answers the same problem the opposite way. Bagnun puts no fish in the broth at all, building it from tomato and onion and adding fresh anchovies only in the last three or four minutes — because a fresh anchovy has almost nothing to give a stock and everything to lose by boiling.

One entry on that list is a temperature, not a time

That list reads as a set of clocks, and one of its entries is not one. Fish bones, vegetables and chicken all sit at a steady simmer, so time is genuinely the variable. Kombu is different, because two things come out of it and they leave at different temperatures. Kal-guksu writes it down: the kelp comes out before boiling "because the bitter compounds leave at higher temperatures than the savoury ones do. Take the glutamate that comes out at 70-80°C and stop there." Shabu-shabu gives the same band from the other side — "it gives up its savouriness at 60-80°C; above that the slippery compounds and bitterness follow."

So the twenty minutes above is only what that window comes to in a pot climbing towards a boil, and it is not the thing to watch. The recipes that use kombu give a sight instead of a number: Udon warms it over low heat and pulls it just before the boil, at bubbles on the edge; shabu-shabu waits for the surface to tremble at about 80°C; and Janchi-guksu, which cites this guide by name for the rule, reads it as "at the boil". No clock fits the climb, because how long it takes belongs to the pot rather than to the kombu.

That puts three positions on one variable, and only the last of them is a clock.

• Below the window, and the ceiling stops binding. Oden soaks its kombu in cold water overnight and only brings it up the next day; shabu-shabu soaks for thirty minutes cold before any heat reaches it; Nikujaga offers cold-steeped kombu as the answer when there is no dashi. Twelve hours against a twenty-minute maximum, and the broth is cleaner for it rather than worse. That is what the cold-brewed kombu further down this page really is — not a shortcut for when there is no time, but the same extraction run below the temperature that costs anything.
• Up through the window and out. The ordinary case, and what the twenty minutes describes.
• In a pot that has to boil anyway, where the clock is all that is left. Ganjang-gejang boils its brine for twenty minutes for the soy, the sugar and the aromatics, so the kelp cannot be given a temperature. It is given ten minutes and lifted out: "it is the base of the savouriness but goes slimy if boiled long."

Which of the three you are in is what decides where the number lands. What is actually coming out is in Building umami.

Do not salt the stock

Stock is not a finished dish, it is an ingredient. Reduce it later, or combine it with something else, and the saltiness doubles. Season in the dish that uses it.

That only holds when there is a later dish. Where the broth is a course, there is no later.

• Ukha has to be finished at the stock stage. And since clarity is the whole of it, the broth is dropped to about 60°C, a beaten egg white is stirred in and brought back up, and the white sets around whatever is suspended and rises to be lifted off.
• Abgoosht serves broth and solids as two separate plates, and both have to be finished in their own right.
• Kongnamul-gukbap goes the other way entirely: the pot holds chicken, water and garlic, and every bit of seasoning happens in each diner's sauce.
• Blanquette de Veau throws its first water away on purpose — up from cold, skim the grey scum, discard — because the second liquid becomes the sauce and cannot be cloudy.
• Ramen is the case where the broth is the course and still goes unsalted. The salt is pulled out of it into the tare, a separate concentrate built to full strength, and the two meet in the bowl — which is why one pot of broth serves shio, shoyu and miso. Same architecture as kongnamul-gukbap above, except the seasoning stops at the bowl instead of travelling to the diner's hand.

And a case where there is no later liquid at all

Both branches above assume the broth stays a liquid — it becomes a sauce, or it is drunk. Another destination removes the question altogether: a grain absorbs the whole of it. Then "season the dish that uses it" and "season the stock" are one act performed at one moment, because the stock is the dish that uses it.

Kabsa writes it into its own step text, and the instruction is the reverse of the rule above: "Measure the remaining broth and bring it to 1.5 times the volume of rice — top up or reduce as needed. Salt it assertively; the rice takes all its seasoning from this liquid." The reason the rule exists left with the liquid: nothing will be reduced and nothing will be combined later, so the saltiness cannot double.

• The ratio is the tell. A recipe that measures the broth to a multiple of the grain rather than "enough to cover" has pinned the quantity, and the concentration is settled the moment you salt it. Maqluba and Mansaf both use that same 1.5 times.
• Or season the grain instead, which comes to the same thing. Maqluba tosses the rice with the spices and the salt, spreads it over the vegetables and pours the broth down the side of the pot. The two meet either way, and neither has anywhere else to go.
• Risotto is the control, and there the rule above still binds. The stock goes in a ladle at a time while the pan reduces throughout, so the concentration climbs as it cooks and the seasoning waits for the mantecatura at the end.
• Hainanese chicken rice is where both branches meet in one pot, and the tighter one wins. That pot goes three ways — the rice drinks two and a half cups of it, what is left is salted into a clear soup, and more of it is blended into the chilli sauce. Only the soup can be corrected at the end, so the pot stays unsalted and each destination seasons itself.

So before reaching for the salt, ask where the liquid ends up. Thrown away, it should taste salty and the amount does not matter (salt and seasoning). Reduced or combined later, leave it alone. Absorbed, what you are seasoning is the finished dish.

See also Salt and seasoning on ingredients that bring salt and acid on one handle.

Storing it

Chill it, lift off the set fat, and it keeps 4–5 days refrigerated or 3 months frozen. Frozen in an ice tray it is easy to drop a cube into a stir-fry. Do not throw away the fat cap — use it as cooking fat; chicken fat in particular is excellent.

Savoury depth without making stock

When there is no time: dried shiitake soaking liquid, cold-brewed kombu (overnight in cold water), soy sauce, miso or fish sauce, tomato paste fried until it darkens, a parmesan rind. The principle is the same — you are adding glutamate and inosinate.

There is also the direction of using what gets thrown away. Making Mozzarella or Rasgulla leaves whey, and Brunost boils that whey down for hours into a cheese. The same instinct as keeping the fat cap off a chilled stock to fry with, taken one step further.