How to Temper Eggs (Without Scrambling Them)

To temper eggs, whisk a few tablespoons of hot liquid into the yolks in a thin stream, keep whisking until about a quarter of the liquid is in, then pour the warmed yolks back into the pot and cook over low heat until the mixture coats a spoon, around 170 to 180°F. Going slowly at the start closes the temperature gap so the proteins thicken the liquid instead of clumping. That's the method behind crème anglaise, crème brûlée bases, pastry cream and yolk-enriched soups.

You've got hot cream on the stove and a bowl of yolks, and you tip in a full ladle to save time. Ten seconds later there are yellow flecks floating in your custard.

The first pour decides everything.

Why do eggs scramble in hot liquid?

Yolks are mostly fat, water and protein. When those proteins hit sudden, intense heat, they tighten and bond to each other in clumps. Warmed gradually and kept moving, they bond loosely with the surrounding liquid instead, and you get a smooth, thickened sauce.

The window you're working in is roughly 160 to 180°F. In that range yolks thicken and enrich. Push past it and the proteins overcook fast, which shows up as graininess. Tempering keeps cold yolks from meeting near-boiling liquid all at once, so the whole batch climbs into that range together.

That 160°F figure comes from the USDA, which recommends cooking egg-containing dishes to 160°F. A finished custard at 170 to 180°F clears it comfortably.

How to temper eggs, step by step

1. Take the chill off the yolks. Pull the eggs from the fridge about 20 minutes ahead. Cold yolks have a bigger gap to close, so they need more tempering liquid and more time.
2. Whisk in the sugar or salt first. Both raise the temperature at which the proteins set, which widens your margin. It's one of the reasons sweet custards are more forgiving than unsweetened ones.
3. Anchor the bowl. Set it on a damp towel so it doesn't spin while you pour with one hand and whisk with the other. Losing control of the bowl for three seconds is enough to scramble the yolks you're pouring onto.
4. Let boiling liquid sit a minute. Scalded milk or barely simmering cream is what you want. If it's at a rolling boil, take it off the heat for a full minute. Pouring 200°F liquid onto yolks is how you get sweet scrambled eggs.
5. Start with a thin stream. Add just a few tablespoons of hot liquid while whisking constantly. Don't stop the whisk during this first addition, even for five seconds. The motion spreads the heat so no single spot overcooks.
6. Pour faster after the first quarter. Once about a quarter of the liquid is in (half a cup if you're working with 2 cups of milk), the yolks are warm enough to take the rest in a steady stream. Keep whisking.
7. Finish low in the pot. Return everything to the pot over low to medium-low heat. Stir constantly with a silicone spatula or wooden spoon, scraping the bottom and corners, and never let it boil.
8. Pull it at the spoon test. Dip a spoon, run your finger across the back, and look at the line. If it holds clean, you're done. If it floods back, keep going. If it looks grainy, you've gone too far.
9. Strain and chill fast. Pour it through a fine-mesh strainer to catch the chalazae (the white cords on the yolk) and any cooked bits. For anything served cold, set the bowl in ice water and stir for 30 seconds to stop carryover cooking and keep a skin from forming.

On electric, use a heavy-bottomed pot and be ready to lift it off the element the moment you feel the sauce tighten, since the burner won't cool as fast as gas. More on that in heat control. And if a pan sauce or anything else is going at the same time, finish it first. You can't walk away once the yolks are in.

On the line, straining every custard is standard, no exceptions. At home it's worth keeping too. It takes 30 seconds and it's the difference between silky and almost silky.

Where this method changes

Pastry cream is the big exception. It's the same tempered base with starch added, and the starch protects the eggs, so you bring it to a boil and cook it briefly to set. The 180°F ceiling doesn't apply there.

Hollandaise and béarnaise skip the hot-liquid step. You cook the yolks gently over a double boiler and whisk in butter, though the principle of controlling egg temperature is the same. The blender method sidesteps most of the risk.

Carbonara tempers the eggs with the hot pasta and its cooking water, off the heat, rather than with a ladle. The pasta does the work, which is why the pan has to come off the burner before the eggs go in.

Soups and chowders use a liaison, which is yolks whisked with cream, tempered with a ladle or two of the hot soup, then stirred into the finished pot. Keep it below a simmer afterward or it curdles just like a custard.

Related: Eggs: 6 Methods, 6 Textures, 0 Failures

Can you save a custard that starts to curdle?

Sometimes. If it's just turning slightly grainy, pull it off the heat immediately, pour it into a blender and blend on high for 30 seconds. That can re-emulsify a lightly broken custard. Strain it afterward either way.

It won't rescue a fully scrambled batch with visible curds. At that point the proteins have set for good, and you're starting over.

If you're new to this, make a sweetened crème anglaise before an unsweetened soup liaison. The sugar buys you a few extra degrees while the motion becomes habit.

Related: How to Brûlée Without a Torch: Use the Broiler