If you would prefer to not use raw eggs you can replace the egg whites with whipping cream (500 ml / 2 cups) and lightly cook the yolk and sugar. To cook the yolks, place the yolks and sugar in a glass mixing bowl and balance this on the top of a pan with a small amount of simmering water in the bottom (double boiler). Whisk the yolks and sugar over the pan allowing the steam to gently cook the yolk. Do not let the water touch the bottom of the bowl.