Set out a double boiler. Beat until thick and lemon colored, 6 egg yolks and ½ cup of sugar. Stir in 1 cup of Marsala wine.
Pour mixture into top double boiler and set over simmering water. Beat constantly with rotary beater until mixture is very light and begins to thicken. When mixture begins to rise, remove from heat. Add berries or fruit, serve hot or cold. Delicious!