Grape marsala cake

Name: Grape marsala cake
Cook time: 2 h
Total time: 2 h
Yield: 16
Ingredients: 7 Eggs (size M); 245 g Sugar; 75 g Flour; 75 g Cornstarch; 25 g Cocoa powder; 3 deleted Tsp Baking Powder; 600 g seedless green grapes; 1 package clear cake nut; 1/4 l white grape juice; 5 sheets white gelatine; 1/2 Vanilla pod; 600 g Whipped cream; 100 ml Marsala (sweet wine); 100 g Dark chocolate coating; 1 package Vanillin sugar; 7-10 Tbsp Cocoa; 8-10 Chocolate decor leaves to decorate; baking paper