1) In a bowl, whip the cream until stiff.
2) In a clean bowl, beat the egg yolks slowly adding the icing sugar and vanilla.
3) Whisk the yolk mixture until light and fluffy.
4) Lightly mix whipped cream in the yolk mixture.
5) Place the bowl in refrigerator until chill.
6) Spoon the Vanilla Sauce over slices of apple if desired.