Lamington Cake

Ingredients (16)

• 8 ounces (1 cup) unsalted butter, softened
• 2 cups granulated sugar
• 4 large eggs
• 2 teaspoons pure vanilla extract
• 2 2/3 cups cake flour
• 2 teaspoons baking powder
• 1/4 teaspoon salt
• 1 cup milk
• 2/3 cup store-bought or homemade raspberry jam 
• 6 ounces dark chocolate
• 3/4 cup milk
• 3 tablespoons unsalted butter
• 1 3/4 cups confectioners' sugar
• 2 1/2 tablespoons unsweetened cocoa powder
• 2 tablespoons boiling water
• 3 cups unsweetened shredded coconut