Homemade German Chocolate Cake

Ingredients
For the Chocolate Cake
2 cups granulated sugar
1-3/4 cups all-purpose flour
3/4 cup unsweetened cocoa powder
1 1/2 teaspoons baking powder
1 1/2 teaspoons baking soda
1 teaspoon salt
2 large eggs
1 cup buttermilk
1/2 cup oil (vegetable or canola oil)
2 teaspoons vanilla extract
1 cup boiling water
For Coconut and Pecan Frosting
1/2 cup light brown sugar
1/2 cup granulated sugar
1/2 cup butter
3 large egg yolks
3/4 cup evaporated milk
1 Tablespoon vanilla extract
1 cup chopped pecans
1 cup shredded sweetened coconut
For the Chocolate Frosting
1/2 cup butter
2/3 cup unsweetened cocoa powder
3 cups powdered sugar
1/3 cup evaporated milk
1 teaspoon vanilla extract
How To Make Homemade German Chocolate Cake