Soak gelatine in cold water. Separate eggs. Mix quark, 90 g sugar and egg yolk. Squeeze the gelatine, dissolve over low heat and mix with 2 tbsp. quark cream, then stir into the rest of the cream.
Whip the cream until stiff. Beat egg whites and 80 g sugar until stiff. As soon as the quark cream starts to gel, fold in first the cream and then the beaten egg white. Divide the mousse into four glasses. Cover and chill for at least 1 hour.
Wash, clean and chop the strawberries. Cut the vanilla pod lengthwise and scrape out the pulp. Finely puree 200 g strawberries and jam with a hand blender. Then pass through a fine sieve.
Fold the remaining strawberries and vanilla pulp into the strawberry sauce. Spread over the mousse just before serving.