For the macaroon mixture, stir marzipan, egg white and sugar until smooth and place in a piping bag with a star-shaped spout. Wash, peel and quarter the apples and remove the core. Cut apple quarters into thick slices and sprinkle with lemon juice.
Cream fat and sugar. Add eggs and stir until foamy. Stir in nuts and milk. Mix flour and baking powder and stir into the dough. Put the dough into a greased springform pan (24 cm Ø) and smooth it down.
Let apple slices drip off a little and place them on the dough in a flower shape. Squirt macaroon mass as spots in the middle. Heat the jelly and spread on the apple slices. Mix the egg yolk and 1 teaspoon of milk and dab the macaroon mixture with it.
Bake in the preheated oven (electric cooker: 200°C/ gas: level 3) for approx. 40 minutes. Cover in between if necessary. Let the cake cool down and dust with icing sugar shortly before serving. Makes about 12 pieces.