Cakes dough: Melt the butter and chocolate . Add the oil and sugar and whip. Add the eggs (one by one) and beat again. Finally add the flour mixed with baking powder and continue beating until a homogeneous mixture. On the filling: Put all products (excluding fruit) in a bowl and mix with a spoon or wire whisk (no need for a mixer). Pour into a baking dish (littered with baking paper) with a diameter of 26 cm about 3/4 of cake mixes. Arrange half pieces of fruit. Spread the filling on it again and arrange remaining berries. Top put into piles of remaining cake mixture. Bake the cake in a preheated 180C oven for about 45 minutes. Check willingness to stick in it should not have raw cake mixture. Allow the cake to cool before removing it from the form.