Fudgy Chocolate Cake

1 cup butter or margarine
1cup water
1/2 cup cocoa
2 cups flour
2 cups sugar
1/2 cup sour cream
2 eggs
1 teaspoon baking soda

Melt the margarine, water and cocoa to boiling, stirring occasionally. Remove from heat. Add rest of ingredients. Beat until smooth, about 2 minutes. Pour into greased 9x13 pan. Bake at 350 for 35 to 40 minutes.
I usually frost it with a butter icing recipe off the back of the icing sugar bag. Sometimes I just frost it with whipped cream. Sometimes I put little holes all over the top of the cake while it's still warm and put a layer of Carmel sauce on the cake. After that cools I put whipped cream on top.