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🍮 Custard: sauce or scrambled egg?

A custard thickens in a band only a few degrees wide. Past that band the same proteins make breakfast.

4
lessons
~20 min
to learn
🔬 Science
subject
Adults
level
Start the course →

What you’ll learn

  1. The protein windowExplain how egg proteins move from a flowing liquid to custard and then scrambled egg.Custard is a temporary protein network caught before it tightens and expels water.
  2. Dilution buys tendernessUse milk, sugar, fat, and starch to predict how custard texture and temperature response change.Ingredients create distance and extra structure around the egg proteins.
  3. Stirred or stillDistinguish a stirred sauce from a baked gel and explain why water baths protect custard.Movement interrupts a network; stillness lets it span a container, while a bath slows heat.
  4. Use the windowApply temperature, visual, and food-safety checks without confusing texture with safety.A thermometer, spoon, wobble, and prompt cooling each answer a different question.

Questions this course answers

What physically makes a custard thicken?

Heat unfolds egg proteins and lets them link into a network that holds liquid. Stop while that network is loose and tender.

Put these protein events in order

Denaturation exposes reactive regions; coagulation links them; continued heating can cause syneresis.

Why use a bain-marie for baked custard?

Water buffers the ramekin from the hotter oven, helping the centre set before the edge overcooks.

Why is a spoon test useful even when you own a thermometer?

Temperature varies with recipe and pan. The coating shows the texture you are actually making.

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