filling. FILLING: Combine 1 tablespoon flour and 1 tablespoon sugar in saucepan. Gradually add 2/3 cup milk and 2 egg yolks (or 1 whole egg). Mix well. Cook over low heat, stirring constantly, until mixture boils and is thick. Cool. Cream margarine then add 1/4 cup sugar, creaming well. Gradually add egg mixture, beating well after each addition. Cover and store in refrigerator until ready to use. ----