Grandma'S German Chocolate Cake - cooking recipe

Ingredients

1 cup margarine, softened
2 cups sugar
2 eggs
1 cup buttermilk
2 1/2 cups flour
2 teaspoons baking soda
1/2 teaspoon salt
1/2 teaspoon baking powder
1/2 cup cocoa
1 cup boiling water
German Chocolate Icing
1 cup evaporated milk
1 cup sugar
3 egg yolks
1/4 lb margarine, softened
1 teaspoon imitation vanilla
1 1/3 cups coconut
1 1/2 cups black walnuts, chopped (you can use English walnuts if you prefer)

Preparation

I make this in either a greased and floured 9 x 12 inch pan or 2 9-inch round pans. For the 9 inch pans I also add wax paper cut to the pan size in the bottom of the pan.
I start checking for doneness after 40 minutes for a 9 x 12 pan, and 25 minutes for the 2 9-inch pans. When a toothpick inserted into the middle of the cake comes out clean it's done.
Cream margarine and sugar.
Add eggs, one at a time, and beat well.
Add buttermilk and dry ingredients.
Add boiling water and beat until mixed.
Bake in a preheated 350 degree oven for 45-55 minutes or until done.
For Icing- Combine milk, sugar, egg yolks, margarine and vanilla.
Cook and stir over medium heat until thickened, about 15 minutes.
Add coconut and nuts.
Beat until thick enough to spread.