Peel 750 g apples, quarter and core them. Cut quarters into cubes. Sprinkle with 3 tablespoons of lemon juice. Chop walnuts coarsely. Put 300 g chocolate coating aside for the icing. Scrape approx. 2 tablespoons of chocolate shavings from 300 g chocolate coating with a peeler. Coarsely chop the remaining chocolate coating.
Melt with butter over a warm water bath. Separate the eggs. Beat egg yolk and sugar with the whisk of the hand mixer until thick and creamy. Stir chocolate butter in a thin stream into the egg yolk mixture. Mix flour and baking powder. Fold in together with the walnuts and apple cubes. Beat egg white and salt until stiff, fold in. Grease a springform pan (26 cm Ø) and dust with flour. Add the mixture and smooth it down. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 55-60 minutes. Cover the cake after about 45 minutes if necessary. Let it cool down on a cake rack. Chop 300 g chocolate coating, melt with coconut oil over a warm water bath. Wash 1 apple, dab dry, quarter and core.
Add the mixture and smooth it down. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 55-60 minutes. Cover the cake after about 45 minutes if necessary. Let it cool down on a cake rack. Chop 300 g chocolate coating, melt with coconut oil over a warm water bath. Wash 1 apple, dab dry, quarter and core. Cut into slices. Sprinkle with 2 tablespoons of lemon juice. Dab the slices dry, dip half of them into the chocolate coating. Place on a tray lined with baking paper. Dip a teaspoon into the couverture and draw lines over the apples, allow to dry. Remove the cake from the tin, place it on a cake rack and place it on a tray. Cover evenly with the remaining couverture, allow to dry. Decorate the cake with chocolate apples and shavings
Sprinkle with 2 tablespoons of lemon juice. Dab the slices dry, dip half of them into the chocolate coating. Place on a tray lined with baking paper. Dip a teaspoon into the couverture and draw lines over the apples, allow to dry. Remove the cake from the tin, place it on a cake rack and place it on a tray. Cover evenly with the remaining couverture, allow to dry. Decorate the cake with chocolate apples and shavings