For the slices, cut the sponge cake into thirds. Whip the cream and Qimiq separately. Mix the cream, Qimiq, cream, rum and vanilla sugar and add the biscuits. Grease the mold well and sprinkle with coconut oil.
Pour half of the dough into the mold and spread the frozen berries on top. Pour the rest of the dough on top and sprinkle with coconut oil,
Leave in the refrigerator for at least 1 day.