Beat oil, eggs and sugar for 5 minutes in a mixer. Heat milk with water to 80°C and blend with cocoa and baking soda. Add the liquid cocoa and the rest of the dry ingredients alternately to the mass in the mixer. At the end add rum. Put the finished mixture on a baking tray and bake for 17 minutes at 180°C.
Chocolate crunch
Heat butter mixed with oil to 100°C. Pour over the chocolate with the spreading cream and mix. Combine the whole mixture with crispy puff pastry flakes.
Dark chocolate mousse cremette
Boil the cream (1), add the gelatin mass and pour over the chocolates. Blend. Beat the cream (2) together with cremette cheese until stiff and combine with 35°C warm ganache.
Whipping ganache
Boil the cream (1), glucose and invert sugar. Pour over chocolate with gelatin mass and blend. Add cream (2) and blend. Add cheese and blend again. Set aside in the refrigerator for 12 h.
Dark confectionery compound coating
Boil water, sugar and glucose to 103°C. Pour over chocolate with gelatin mass and blend. Add cream and blend again. Set aside in the refrigerator for 12 h.
Assembly
Spread the crunch over the baked sponge cake and freeze. Pour over the dark chocolate mousse and refrigerate until set. Then spread the whipping ganache and refrigerate for 12 h. Pour the 35°C warm confectionery compound coating over the finished cube and set aside to set. Additionally, decorate the cube with dark chocolate.