Worried your custard will turn into scrambled eggs? Here’s how to make custard that stays silky: heat the milk, whisk it slowly into the yolks, then cook gently to 175 to 180 degrees, stirring constantly.
This guide sits alongside our other easy cake and dessert recipes.
| Item | Value |
|---|---|
| Base ratio for about 2 cups of sauce | 5 large egg yolks, 1 ½ cups whole milk, ¼ cup sugar |
| Finishing temperature (recipe) | 175 to 180 degrees on an instant-read thermometer |
| Cooking time over low heat | 5 to 8 minutes |
| Temperature to stay under | 190°F (87°C) |
| Rescue for curdled sauce | 1-2 ounces (30-60 mL) cold milk, then blend |
| Fridge storage | Up to 2 days |
These figures come from the America’s Test Kitchen crème anglaise recipe and Wayne Gisslen’s crème anglaise method in Professional Cooking. Recipes and guidance can change, so check the source before you rely on them.
Why custard curdles
Custard is milk and egg yolks cooked until the egg proteins set and thicken the liquid. Push the heat too far or too fast and those same proteins tighten into tiny scrambled bits, which is what we call curdling.
The window between thickened and scrambled is narrow. Rouxbe’s food safety page says egg yolks start to coagulate around 149°F (65°C), and Gisslen says to never let a custard sauce go above 190°F (87°C) or it is likely to curdle.
Three habits cause most of the trouble:
- Letting sugar sit on the yolks. Gisslen notes that sugar and egg yolks left together without mixing create lumps that cannot be beaten out, so whisk as soon as the sugar goes in.
- Cooking over high heat. America’s Test Kitchen’s recipe says to heat the custard slowly, stirring continuously, over low heat.
- Stirring only the middle. The same recipe says to run the spoon along the sides and bottom of the saucepan to prevent the yolks from curdling.
What you need for a basic stirred custard
The America’s Test Kitchen crème anglaise makes about 2 cups and uses a short ingredient list. Here is what goes in:
- 5 large egg yolks
- 1 ½ cups whole milk
- ¼ cup sugar
- A pinch of salt
- ½ vanilla bean, or 1 teaspoon vanilla extract stirred into the finished sauce
For equipment, the recipe calls for a medium saucepan, a medium bowl, a wooden spoon, a fine-mesh strainer and an instant-read thermometer. A whisk handles the yolks. Keep in mind that Gisslen describes this as a very light sauce, so don’t expect pudding-thick results.
How to make custard, step by step
The method below follows the America’s Test Kitchen recipe, with extra detail from Gisslen. Read it through once before you start, because the final cooking moves quickly.
- Infuse the milk. Heat the milk with the vanilla seeds and pod until steaming, then cover and steep for 20 minutes, per the America’s Test Kitchen recipe. Reheat until steaming again. Gisslen’s version heats the milk to scalding, just below simmering, which makes the final cooking much shorter.
- Whisk the yolks. Beat the yolks with the sugar and salt right away, until pale yellow.
- Temper. Slowly pour 1/2 cup of the hot milk into the yolk mixture, whisking constantly.
- Cook. Return everything to the saucepan and cook over low heat, stirring constantly with a wooden spoon. The sauce is ready when it coats the back of a spoon with a thin film and reads 175 to 180 degrees, which takes 5 to 8 minutes in the recipe.
- Strain and cool. Pour the sauce through a fine-mesh strainer right away, then cool it quickly, for example in a bowl set over ice water.
The spoon test is a handy backup. Gisslen says the sauce is cooked when it lightly coats the back of a spoon instead of running off like milk.
Do you need to temper the eggs?
Tempering means whisking a little hot milk into the yolks before they go in the pan. America’s Test Kitchen tested three batches of crème anglaise to see whether it matters: one tempered the traditional way, one with the eggs warmed with the sugar first, and one with everything mixed together at the start.
The batch with warmed eggs showed signs of curdling as soon as the eggs hit the hot milk. The all-in-one batch was identical to the tempered control, with the same smooth consistency and thickness.
The explanation is dilution, not gentle warming: the test kitchen says tempering works because liquid dilutes the uncooked egg proteins, making it harder for them to link up into clumps. The real benefit of tempering is that the milk is already hot, so you need less constant stirring, though it does take extra bowls.
You can skip it if you want. Petra Paredez’s custard sauce in Pie for Everyone skips tempering, as long as you have a candy thermometer and stir without pause. If you are new to custard, tempering is the more forgiving route.
Fixing curdled custard and keeping it safe
A sauce that starts to curdle is sometimes salvageable. Gisslen says to immediately stir in 1-2 ounces (30-60 mL) cold milk, move the sauce to a blender and blend at high speed.
Once it is cooked, cool it fast. The recipe says to strain it into a clean, airtight container with plastic wrap pressed flush against the surface to prevent a skin, and to refrigerate it for up to 2 days.
Egg mixtures also call for clean habits. Gisslen warns that egg mixtures are good breeding grounds for bacteria that cause food poisoning, so use clean, sanitized equipment. Rouxbe adds that if you are concerned about salmonella, you can use pasteurized eggs or cook the eggs to at least 165°F, though that can potentially cause the eggs to scramble.
Ways to use your custard
Custard sauce is pourable, so it suits warm desserts and fruit. Spoon it beside a slice of cake, and if you are baking one, here is how to level and layer a cake so the slices look as good as they taste.
Custard also pairs naturally with pastry, so it helps to know how to make pie crust for a base. Keep the sauce chilled until you serve it.
Frequently asked questions
How do I know when custard is done?
Show answer
Look for a sauce that thickens slightly and coats the back of a spoon with a thin film. The America’s Test Kitchen recipe pulls it at 175 to 180 degrees, while Gisslen’s method calls it cooked at 185°F (85°C). Pick one target and stay well under 190°F (87°C).
Can I make custard without a thermometer?
Show answer
Yes, use the spoon test: the sauce is done when it lightly coats the back of a spoon instead of running off like milk. A thermometer gives you a safety margin, though, and Paredez’s no-tempering recipe depends on one.
Why is my custard lumpy before I even cook it?
Show answer
Sugar and yolks were probably left sitting together. Gisslen says this creates lumps that cannot be beaten out, so whisk the moment the sugar is added.
How long does custard sauce keep?
Show answer
The America’s Test Kitchen recipe says to refrigerate it in an airtight container for up to 2 days. Press plastic wrap flush against the surface to stop a skin forming.
