Wash the currants and remove from the panicles. Drain on kitchen paper. Beat the fat, 100 g sugar, lemon zest and salt with the whisk of the hand mixer until foamy.
Separate eggs. Set aside the egg white. Gradually stir the egg yolk into the fat mass. Mix flour, hazelnuts and baking powder and stir into the fat-egg mixture alternately with the milk. Carefully fold in the currants.
1 muffin tin (12 trays) with paper cups. Spread the dough on them. Bake in the preheated oven (electric: 175 ° C/ gas: level 2) for 20 minutes. Beat the egg white until stiff. Gradually pour in 100 g sugar.
Take out the muffins. Spread the egg whites on top and bake for another 10 minutes. Take out the muffins and let them cool down on a cake rack. Roll currant pancakes in sugar and decorate the muffins with them.