Peel, quarter, core and cut apples into large pieces. Sprinkle with lemon juice. Mix pudding powder and 50 ml apple juice. Boil up the rest of the apple juice. Stir in the mixed powder. Add apple pieces and simmer for 3-4 minutes.
Pour into a bowl and let cool off. Place the puff pastry slices next to each other and let them thaw. In the meantime whisk marzipan, 2 egg yolks and 2 tablespoons of condensed milk. Roll out each pastry slice to a rectangle (approx. 12 x 18 cm) on a floured work surface. Spread with marzipan mixture. Turn the corners inwards. Cover evenly with apple compote. Whisk 1 egg yolk and 1 tablespoon condensed milk. Spread the edges of the dough with it. Place the Copenhagen on 3 baking trays lined with baking paper. Sprinkle with almond slivers. Bake the trays one after the other in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 15-20 minutes.
Cover evenly with apple compote. Whisk 1 egg yolk and 1 tablespoon condensed milk. Spread the edges of the dough with it. Place the Copenhagen on 3 baking trays lined with baking paper. Sprinkle with almond slivers. Bake the trays one after the other in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 15-20 minutes. Remove and let cool on a cake rack. Decorate with mint
1 1/2 hours waiting time