For the strawberry bomb, mix the curd, yogurt, powdered sugar and vanilla sugar well, heat the rum and gelatine.Mix the strawberries with the curd mixture and stir in the rum-gelatine mix.
Cut the cooled sponge cake roulade into pieces and arrange them tightly in a hemispherical form. Pour the strawberry cream on top and cover with the roulade pieces.
Refrigerate overnight. Decorate the strawberry bomb with fresh strawberries and whipped cream.