For the chocolate base, divide 60 g chocolate into pieces and melt in a hot water bath. Leave to cool a little. Cream 100 g soft butter, 100 g sugar and 1 pinch of salt with the whisk of the mixer. Stir in 3 eggs one by one. Stir in liquid chocolate and 1 tbsp. cream. Mix 125 g flour, baking powder and cocoa and also stir in briefly.
Spread the dough into a greased springform pan (26 cm Ø) sprinkled with flour. Bake in a preheated oven (electric cooker: 180 °C/circulating air: 160 °C/gas: see manufacturer) for approx. 25 minutes. Let them cool down. Clean the springform pan and grease again.
For the shortcrust 150 g flour, icing sugar, 75 g cold butter in pieces, 1 egg yolk and 1 tbsp cold water, first with the dough hooks of the mixer, then quickly knead with your hands to a smooth dough. Roll out the dough to a round shape (approx. 26 cm), place in the form and prick several times with a fork. Chill for about 20 minutes. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 180 °C/gas: see manufacturer) for approx. 15 minutes. Let them cool down.
For the compote, peel, quarter, core and finely dice apples. Bring to the boil with lemon juice, half of the cider and 5-6 tbsp. sugar and simmer for about 3 minutes. Stir pudding powder and the rest of the cider until smooth. Stir into the apples and simmer for about 1 minute.
Spread the short pastry base with jelly and place a cake ring around it. Cut the chocolate base in half horizontally. Place the bottom half on the jelly and spread with compote. Chill for about 1 hour.
Whip 300 g cream, cream stiffener and 1 packet of vanilla sugar until stiff. Spread on the compote. Place the upper chocolate base on top. Chill for about 30 minutes.
Whip 300 g cream and 1 packet of vanilla sugar until stiff. Spread the cake with it. Grate 30 g chocolate and sprinkle it on the cake. Decorate the edge of the cake with apple slices if desired.