Coarsely grate the chocolate. Melt fat and chocolate at low heat and remove from the stove. Whisk eggs. Coarsely chop the pecans. Stir 500 g sugar, vanillin sugar, eggs, flour, salt, nuts and rum into the lukewarm chocolate.
Cover baking tray with baking paper. Spread the dough evenly on the baking tray. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 15-20 minutes. Take out and let cool down. Coarsely chop the chocolate coating, melt the chocolate coating and coconut oil on a hot water bath. Spread the cake evenly. Let it set. Cut the cake into rectangles of about 6 x 5 cm. Melt 2 tablespoons of sugar in a pan (do not let it get too hot). Pour small and large drops and small abstract figures onto baking paper.
Let it set. Cut the cake into rectangles of about 6 x 5 cm. Melt 2 tablespoons of sugar in a pan (do not let it get too hot). Pour small and large drops and small abstract figures onto baking paper. Allow to set. If necessary, melt 2 more tablespoons of sugar and do the same. Decorate brownies with it