German Chocolate Cake

INGREDIENTS

• :
• 2 ounces bittersweet or semisweet chocolate, chopped
• 2 ounces unsweetened chocolate, chopped
• 6 tablespoons water
• 1 cup unsalted butter, at room temperature
• 1¼ cup + ¼ cup granulated sugar, divided
• 4 eggs, yolks and whites 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 granulated sugar
• 3 egg yolks
• 6 tablespoons butter, cut into small pieces
• 1 cup pecans, toasted and finely chopped
• 1 1/3 cups unsweetened coconut, toasted
• 2/3 cup water
• ½ cup granulated sugar
• 4 teaspoons dark rum
• 8 ounces bittersweet or semisweet chocolate, chopped
• 2 tablespoons light corn syrup
• 3 tablespoons unsalted butter