Chocolate Marble Cake Recipe

Name: Chocolate Marble Cake Recipe
Prep time: 25 min
Cook time: 45 min
Total time: 1 h 10 min
Cuisine: European, German
Ingredients: 100 grams (3 1/2 ounces) good-quality bittersweet chocolate; 4 eggs; 220 grams (1 cup plus 2 tablespoons) sugar (I use a blond unrefined cane sugar); 120 ml (1/2 cup) yogurt or buttermilk, or whipping cream; 220 grams (7 3/4 ounces, about 1 2/3 cups) flour; 2 teaspoons baking powder; 120 grams (1/2 cup plus 1 teaspoon) butter, melted and cooled (I use semi-salted, add a good pinch of salt if you use unsalted); 1 teaspoon pure vanilla extract (possibly homemade); 1 tablespoon cacao nibs (optional); 40 ml (1/6 cup) water; 1 tablespoon cacao liqueur or liqueur/brandy of your choice (optional); 15 grams (1 rounded tablespoon) sugar