Cake:

• 2 cups granulated sugar (400 g)
• 1 3/4 cups all-purpose flour (210 g)
• 3/4 cup unsweetened cocoa powder (75 g)
• 1 1/2 teaspoons baking powder (6 g)
• 1 1/2 teaspoons baking soda (7.5 g)
• 1 teaspoon salt (5 g)
• 2 large eggs
• 1 cup buttermilk (240 ml)
• 1/2 cup oil (vegetable or canola oil) (120 ml)
• 2 teaspoons vanilla extract (10 ml)
• 1 cup boiling water (240 ml)

German Chocolate Frosting:

• 1/2 cup light brown sugar (100 g)
• 1/2 cup granulated sugar (100 g)
• 1/2 cup butter (115 g)
• 3 large egg yolks
• 3/4 cup evaporated milk (180 ml)
• 1 Tablespoon vanilla extract (15 ml)
• 1 cup chopped pecans (120 g)
• 1 cup shredded sweetened coconut (80 g)

Chocolate Buttercream Frosting:

• 1/2 cup butter (115 g)
• 2/3 cup unsweetened cocoa powder (65 g)
• 3 cups powdered sugar (360 g)
• 1/3 cup evaporated milk (80 ml)
• 1 teaspoon vanilla extract (5 ml)