5 egg yolks 2/3 cups sugar 1 cup half and half 2 tablespoons butter 1 cup whipping cream 2 teaspoons vanilla extract
Beat yolks and sugar until blended. Pour in top of double boiler. Stir in half and half. Cook and stir over boiling water until thickens. Set aside - stir in butter. While cooling on a rack, stir occasionally until room temperature. Stir in whipping cream and vanilla. Freeze according to manufacturers directions.