Mix pudding powder, 50 g sugar and 5 tablespoons milk. Boil up the rest of the milk and 100 ml advocaat. Stir the mixed custard powder into the boiling advocaat milk, bring to the boil and simmer for about 1 minute. Pour into a bowl, place foil directly on the surface of the pudding. Leave to cool, but do not refrigerate.
Preheat the oven for the muffins (electric oven: 200 °C/circulating air: 180 °C/gas: see manufacturer). Grease the twelve troughs of a muffin tray. Cut 12 circles (each approx. 12 cm Ø) from baking paper and place them in the trays. Peel, wash and roughly grate the carrots. Separate the eggs and beat the egg white until stiff. Mix carrots, egg yolks, almonds, 100 g sugar and lemon juice with the whisk of the mixer. Fold in the beaten egg whites. Fill the dough into the bowls and bake in a hot oven for 15-20 minutes. Take out and let cool down.
For the chocolate sauce 1⁄8 boil up l water, 125 g sugar and 1 pinch of salt. Stir in cocoa and simmer for 3-4 minutes. Let the sauce cool down, stirring from time to time.
Whip 250 g butter with the whisk of the hand mixer until creamy. Stir the room-warm pudding briefly, then add it to the butter by the spoonful while stirring. Pour the buttercream into a piping bag with a large star-shaped spout and squirt onto the muffins. Sprinkle with the chocolate sauce.