Soak the cranberries in 3 tablespoons of rum. Mix 125 g flour and 1/2 teaspoon baking powder in a bowl. Add 60 g sugar, 60 g soft butter and egg yolk and knead to a smooth shortcrust pastry. Cover and chill for about 30 minutes. In the meantime peel apples, remove seeds and cut them into pieces. Mix with 2 tablespoons lemon juice.
For the shortcrust pastry, mix 125 g butter, 100 g sugar and lemon zest until creamy. Stir in the eggs one after the other. Add 2 tablespoons of lemon juice and cream, 175 g flour and 2 teaspoons of baking powder. Grease a springform pan (26 cm Ø) and dust with flour. Fill in the sponge mixture and smooth it down. Mix apples and cranberries and spread on top. Roll out short pastry between 2 layers of foil in the size of the springform pan and lay it over the apples. Press a little bit on the edge. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 1 hour. Take out and let cool down. Mix icing sugar with 3 tablespoons of rum and spread evenly on the shortcrust pastry.
Mix apples and cranberries and spread on top. Roll out short pastry between 2 layers of foil in the size of the springform pan and lay it over the apples. Press a little bit on the edge. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 1 hour. Take out and let cool down. Mix icing sugar with 3 tablespoons of rum and spread evenly on the shortcrust pastry. Sprinkle with granulated sugar. Whipped cream tastes good with it