wunder beta🍲 Stocks and soups: extraction in slow motion
A stockpot is a slow extraction machine. Collagen, gelatine, temperature and why boiling ruins a clear broth.
What you’ll learn
- A pot is an extraction machineDescribe stock-making as an extraction into water and distinguish stock, broth, bone broth and dashi.Hot water pulls soluble proteins, minerals, aromatics and gelatin out of solids; how long you leave them and what you use decides whether you have a stock, a broth or a dashi.
- Collagen becomes gelatinExplain how moist heat converts collagen to gelatin, and choose cuts and cooking times accordingly.Collagen unwinds into gelatin above roughly seventy degrees, giving body and a cold-set wobble; collagen-rich cuts reward long cooking while vegetables and fish need very little.
- Clarity is a temperature decisionExplain why boiling clouds a stock, and describe skimming, straining and consommé clarification.A bare simmer lets fat float and particles settle while a boil suspends both; skimming removes coagulated protein, and an egg-white raft can filter a stock to glass clarity.
- Building the flavourUse mirepoix, roasting, aromatic timing, umami ingredients and reduction to control a stock's character.Mirepoix and roasting build the base flavours, aromatics go in late because they evaporate, dashi shows how umami synergy shortcuts the process, and reduction concentrates everything including salt.
- From stock to soup, safelyTurn stock into soup by managing body, texture and finish, and cool and store it safely.Body comes from gelatin, starch or purée rather than necessarily from cream; a big pot must be cooled fast in shallow containers, and a stock that gels is proof the extraction worked.
Questions this course answers
Your stock tastes good but feels thin and watery in the mouth. What most likely went wrong?
Body comes from gelatin, and gelatin comes from collagen in connective tissue. Lean meat gives flavour but no wobble; feet, wings, knuckles and shanks give both.
Why does a boiled stock come out cloudy?
Clarity is a physical question about what stays suspended. A bare simmer lets particles settle and fat float where you can skim it; a rolling boil keeps everything churning through the liquid.
Put the stages of clarifying a consommé in order
The raft works because the egg proteins coagulate slowly enough to sweep the whole pot on the way up. Starting hot, or boiling later, destroys that.
Above roughly what temperature does collagen begin converting to gelatin in a moist pot?
Around seventy degrees, and faster as you go hotter - which is why a gentle simmer near ninety works well and a pressure cooker at about a hundred and twenty is quicker still.
Match each ingredient to what it contributes to a stock
A stock is assembled from separate contributions - body, roast flavour, savouriness and aroma - and each has its own best moment to go in.
Complete the sentence about seasoning
Reduction removes water and leaves salt behind. A stock seasoned to taste and then halved in volume is twice as salty as you intended.
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