This is also known as "English Custard" and "Custard Sauce."

2 cups cream or milk
1/2 vanilla bean or 2 teaspoons vanilla extract
4 egg yolks
1/3 cup granulated sugar

If using a vanilla bean, split it lengthwise, then scrape with the back edge of a knife and add to the cream seeds, pod and all. If you are using vanilla extract, add it after cooking. In a heavy saucepan, barely boil the cream and the prepared vanilla bean.

Set a large fine mesh strainer over a bowl set in a larger bowl of ice. In the top of a double boiler, whisk the yolks and sugar by hand or with a portable electric mixer until thick and smooth, about 30 seconds. Slowly whisk in the hot cream and vanilla bean. Cook in the double boiler set over simmering water, stirring gently and constantly all around the bottom and corners with a wooden spatula. Eventually the foam will subside. The Cr?e Anglaise is done when it coats a wooden spoon without bare spots, 12 to 15 minutes. Immediately pour through the strainer. If you are using vanilla extract, add it now.

To keep Cr?e Anglaise warm for serving, place it in a bowl set in a larger pot of hot water.

To store, cover with plastic wrap pressed directly onto the surface of the Cr?e Anglaise, and refrigerate.

For a flavor variation, add 1 teaspoon cinnamon to vanilla-flavored cream, or replace vanilla extract with 2 teaspoons brandy, rum, amaretto, Kahla or Grand Marnier.