How to Temper Eggs for Smooth Custards and Sauces

Why Tempering Matters

Tempering is the process of slowly raising the temperature of a cold or room-temperature ingredient—usually eggs—before adding it to a hot liquid. Without this step, the heat of a boiling liquid would cause the egg proteins to coagulate instantly, resulting in bits of cooked scrambled eggs in your custard or sauce. By introducing heat gradually, you allow the proteins to uncoil and bond slowly, creating a thick, stable emulsion.

Step 1: Whisk Your Eggs Thoroughly

Start by placing your eggs or egg yolks into a medium-sized heat-proof mixing bowl. Whisk them vigorously until they are uniform and slightly pale. This breaks down the proteins and prepares them for the incoming heat. If your recipe calls for sugar, whisking it into the eggs at this stage can also help provide a protective buffer against the heat.

Step 2: Heat Your Liquid Base

While whisking your eggs, heat your milk, cream, or broth in a saucepan until it reaches a simmer. You want the liquid to be hot but not necessarily at a rolling boil, as extreme heat makes the tempering process more difficult and increases the risk of curdling.

Step 3: The Slow Drizzle

Using a ladle or a measuring cup, slowly drizzle a tiny stream of the hot liquid into the egg bowl while whisking the eggs constantly with your other hand. The goal is to keep the eggs in motion so no single part of the mixture gets too hot too fast. Continue this process until you have incorporated about half of the hot liquid into the eggs.

Step 4: Combine and Finish

Once the egg mixture feels warm to the touch, it is successfully tempered. Now, you can safely pour the warmed egg mixture back into the saucepan containing the remaining hot liquid. Return the pot to low or medium-low heat and continue to stir constantly with a wooden spoon or whisk until the sauce reaches your desired thickness or coats the back of a spoon.