3½tablespoonscornstarch or 6tablespoonsall-purpose flour
3egg yolks, lightly beaten
Mix the sugar, cornstarch and salt in a bowl. Pour the hot milk over the mixture, stirring constantly. Place in the top part of a double boiler and cook over low heat, stirring, until the mixture thickens. Cover and cook for ten minutes longer.
Stir a little of the hot mixture into the egg yolks. Add to the remaining mixture in the pan and cook over hot water, stirring, for about two minutes, until thickened. Cool and add the vanilla.