Ingredients

6 large egg yolks 

1/2 cup sugar 

2 tablespoons flour 

2 tablespoons cornstarch 

2 cups whole milk 

1/2 teaspoon vanilla extract 

Preparation

In a medium bowl, beat egg yolks and sugar until thick and light; beat in flour and cornstarch.

In a saucepan, bring milk just to a boil; whisking constantly, gradually add milk to egg mixture.

Return mixture to saucepan. Bring to a boil, whisking constantly to prevent scorching, until mixture is thick and pulling away from sides of pan, 4 to 5 minutes. Stir in vanilla.

Using a rubber spatula, press mixture through a sieve into a bowl. Cover surface directly with plastic wrap, and cool to room temperature in refrigerator.