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📘 Starch Gelatinization: Roux, Slurry, and the Thickening Curve

You stir cold water into cornstarch and get milk; heat it and, somewhere between warm and simmering, the spoon begins to leave a wake. That change is not water becoming heavier: partly crystalline starch granules take up water, swell, and r

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. The granule wakes upExplain gelatinisation as swelling granules, amylose leaching and a temperature range rather than a single switch.Water, heat and starch build viscosity through a changing population of granules. Source and recipe conditions shift the curve.
  2. Roux buys you dispersionShow how roux disperses flour, adds flavour and trades thickening power for darker colour as cooking continues.Fat helps separate flour particles before hydration. Moderate heating can help; very dark cooking can weaken the thickener.
  3. A slurry starts coldUse a cold-water slurry to prevent lumps and understand why heating, not mixing alone, creates the body.A slurry keeps starch particles separate until they enter hot liquid. Patience prevents the overshoot that comes from adding too much too soon.
  4. The curve has a peakCompare roux and slurry as two routes to gelatinisation, then read texture by spoon, ribbon and cooling behavior.Both methods depend on water, heat and concentration. Cooling and reheating can reorganise the starch network, so serving temperature matters.

Questions this course answers

What changes as starch gelatinises in water?

Heat and water disrupt the granule’s ordered regions. Swelling and amylose leaching raise viscosity.

Match each technique to the route it takes

Roux and slurry mainly differ in how they prevent dry starch from forming lumps before gelatinisation.

A useful general gelatinisation band for many food starches is roughly what range?

Many food-science references place starch gelatinisation broadly around 60–80 °C, with the exact range depending on source and conditions.

Put the thickening curve in order

The familiar spoon-coating stage sits in the middle of a process, not at the first moment starch touches water.

Why might a cook choose a slurry instead of a roux?

Both routes rely on gelatinisation, but they offer different flavour, timing and texture trade-offs.

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