Combine all the chocolate cream ingredients in a bowl, warm it up for 30 seconds in the microwave and mix well until you get a smooth texture.
Pour ¾ of the chocolate cream over the crushed biscuits, and transfer ¾ of the mixture to a large loaf pan lined up with parchment paper.
Put a layer of parchment paper on top, press lightly and freeze for 7 minutes.
Whip the heavy whipping cream and the vanilla paste/extract until you get a thick texture.
Take out the pan from the freezer and add a thick and even layer of vanilla cream.
Pour the rest of the chocolate sauce on the vanilla cream layer and spread it evenly.
Use the rest of the biscuit-chocolate mixture to make 8 chocolate balls. Roll each one in coconut flakes and/or chopped hazelnuts and place them on top of the cake.
Store in the freezer.