Grease and flour gugelhupf form (Bundt pan). (or sprinkle with fine bread crumbs instead of flour)
Peel and pit apples, cut in small pieces.
Beat butter, half of the sugar and vanilla until light and creamy.
Mix-in egg yolk one at a time.
In a separate bowl whisk egg whites with remaining sugar and salt until it is stiff.
Mix flour, baking powder, walnuts and chocolate in a bowl.
Fold in the flour-mix and stiff egg whites in the butter mixture.
Last, fold in the apples.
Put batter in bundt pan and smooth.
Bake in preheated oven at 170° C for about 60 minutes.
Leave to cool.
For the glaze melt chocolate and coconut oil over bain-marie.
Glaze the cake and leave to cool.