Heat 1/4 cup sugar until melted. Cook 2 minutes, then add 1/2 cup water and stir until sugar is dissolved. Cook until syrup spins a thread. Pour gradually over egg yolks that have been beaten until light lemon colored, beating constantly. Blend 1/2 cup sugar and flour, add milk, and cook until thickened, stirring thoroughly and frequently. Add egg yolk mixture and cook several minutes longer. Cool. Stir in flavorings and fold in whipped cream. Freeze. Makes 2 quarts.