Put butter in a large skillet. Melt it at low heat. Then add milk and cocoa. Boil it with stirring over medium heat. Then, add bitter chocolate. Take the pan from the stove. Wait for chocolates melt by itself. Then stir for a while and leave to cool.
At Biscuits Mosaic Cake Snacks recipe, we will not use sugar. This is one of the difference from "Biscuits Mosaic Cake Recipe".
Crumble all the biscuits into a deep bowl. Try to crumble biscuits in medium size. Pour the cacao-chocolate sauce on biscuits. The chocolate sauce should be cool. Then, add chopped hazelnuts and mix softly with a spoon. Leave to rest for 10 minutes. The biscuits will absorb the sauce.
When the mosaic cake is cool enough, wrap in aluminium foil or stretch film. Press down with your hands on the sides and give it the shape of the thin-log bar shape.
Leave the freezer for 2-3 hours. Then remove the mosaic cake from the freezer. Slice with a knife. Serve cold with tea or coffee.
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