Beat the egg whites with a pinch of salt until stiff and chill. Melt 100 g dark chocolate over a water bath. Mix 80 g butter with 100 g xylitol until creamy. Then gradually add the egg yolks and stir, stir, stir. Then add about 2 tablespoons of strong coffee and stir in the melted chocolate.
Mix 200 g of ground almonds with 60 g of chopped almonds or flaked almonds and a little baking soda and gradually add to the mixture, but not all at once. Then fold in the egg whites.
Pour the mixture into muffin molds and bake at 180 ° C top / bottom heat for 20-25 minutes. The time is for a regular steel muffin pan. In the paper cases in the photo without sheet metal, which also hold a little more, it naturally takes longer, so do the chopsticks test.
Then take them out of the oven and drizzle some rum while they are still hot. 1 - 2 teaspoons per muffin should be enough!