Coarsely grate or finely dice the marzipan. Knead with nuts, almonds and rum. Wash the apples and remove the core with an apple corer
Fill apples with the marzipan-nut mixture. Place in a greased ovenproof dish. Put the fat in flakes on top. Bake in a hot oven (electric cooker: 175 °C/ convection oven: 150 °C/gas: level 2) for 20-25 minutes
Mix the milk and sauce powder in the high mixing bowl with the whisk of the hand mixer for approx. 1 minute. Dust the baked apples with icing sugar and serve with the vanilla sauce