Vanilla and Cocoa Marble Cake with Hazelnuts Ingredients: 150g (3/4 cup) sugar 2 eggs 300g (2 1/2 cups) flour 80ml (6 tbsp) olive oil 150ml (3/5 cup) milk 1 tablespoon vinegar 5g (1 teaspoon) baking powder 1/3 teaspoon salt 1 tablespoon cocoa powder Vanilla syrup Hazelnut kernels Directions: