German Chocolate Cake

Name: German Chocolate Cake
Ingredients: 2 ounces bittersweet or semisweet chocolate chopped; 2 ounces unsweetened chocolate, chopped; 6 tablespoons water; 8 ounces (2 sticks) unsalted butter, at room temperature; 1 ¼ cup + ¼ cup sugar; 4 large eggs, separated; 2 cups all-purpose flour; 1 teaspoon baking powder; 1 teaspoon baking soda; ½ teaspoon salt; 1 cup buttermilk, at room temperature; 1 teaspoon vanilla extract; 1 cup heavy cream; 1 cup sugar; 3 large egg yolks; 3 ounces butter, cut into small pieces; 1 cup pecans, toasted and finely chopped; 1 1/3 cups unsweetened coconut, toasted; 1 cup water; ¾ cup sugar; 2 tablespoons dark rum; 8 ounces bittersweet or semisweet chocolate, chopped; 2 tablespoons light corn syrup; 1 ½ ounces unsalted butter