Soak gelatine in cold water. Separate eggs. Egg yolk with 1 go. Stir tbsp. sugar and vanilla sugar until creamy. Stir in advocaat, up to 4 tsp. Squeeze the gelatine and dissolve over a mild heat.
First stir in 2 tablespoons of the egg mixture, then stir into the rest of the mixture. Chill until it begins to gel.
Separately beat egg whites and cream until very stiff. First fold the beaten egg whites and then the cream into the advocaat mixture. Cover the mousse and chill for at least 4 hours.
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