Knead 125 g sugar, butter and flour with the dough hooks of the hand mixer to crumbles and chill. Wash apples, grate dry and cut into quarters. Remove the core and cut the quarters into 6 slices each. Bring 2 tablespoons sugar and 3 tablespoons water to the boil. Add liqueur and apple slices and stew for 2-3 minutes. Remove the slices with a skimmer and place them in 4 small moulds (each 15 cm Ø).
Boil down the stock for 3-4 minutes until syrupy. Pour syrup over the apples. Spread crumbles on the apples. Bake in the preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 20 minutes until golden brown. Serve warm crumble with the eggnog