Step 1

Combine sugar, flour, and salt in a heavy medium saucepan. Whisk in the milk and place over medium heat. Cook, stirring constantly, until just hot.

Step 2

In a small bowl, beat the egg yolks until smooth. Add about 1/2 cup of the hot milk mixture to the beaten eggs and stir vigorously.

Step 3

Pour the milk and egg mixture back into the saucepot and cook, stirring constantly over medium heat, until the custard begins to thicken.

Step 4

Remove from heat and add the vanilla extract. Pour the custard through a strainer (if you like) and into a small pitcher or gravy boat. Cool, cover with plastic wrap and refrigerate until ready to serve.