Tempering - The Cook Book

What You're Doing

Slowly introducing a hot liquid into a cold, temperature-sensitive ingredient (like eggs or chocolate) by adding small amounts at a time while stirring. This raises the temperature gradually so proteins don't coagulate suddenly or chocolate doesn't seize.

Visual Cues

Look for these signs to know your technique is working:

Mixture warming smoothly without lumps
Eggs thinning out as warm liquid is whisked in
No visible scrambling or curdling at the edges
Smooth, glossy texture when fully combined

Why It Works

Egg proteins denature and coagulate suddenly at around 70°C. By gradually raising the temperature — a few spoonfuls of hot liquid at a time while whisking — you bring the eggs up to temperature slowly so they thicken evenly instead of scrambling into curds. The same principle applies to chocolate, where sudden heat causes cocoa butter crystals to seize.

Failure Modes

Avoid these common problems:

Adding too much hot liquid at once - instant curdling
Not whisking during addition - uneven heating creates lumps
Base liquid too hot when combining - scrambles on contact
Working too slowly - mixture cools and doesn't incorporate

Requirements & Guidelines

Whisk continuously while adding hot liquid
Add hot liquid gradually in small increments
Return tempered mixture to heat gently