German chocolate cake

Ingredients

Chocolate Cake
2 cups all-purpose flour
2 cups sugar
¾ cup cocoa
2 teaspoons baking powder
1½ teaspoons baking soda
1 teaspoon salt
1 cup milk
½ cup vegetable oil
2 eggs
2 teaspoons vanilla extract
1 cup boiling water

German Chocolate Frosting
1 cup evaporated milk
1 cup white granulated sugar
3 egg yolk, beaten with 1 teaspoon water
1/2 cup butter or margarine
1 teaspoon vanilla extract
1 cup chopped pecans
1 cup flaked coconut
1 tablespoon of cornstarch