Texas Sheet Cake

2 cubes butter
4 Tbs. cocoa
1 cup water
2 cups flour
2 eggs
½ tsp. salt
2 cups sugar
½ cup sour cream
1 tsp. baking soda

Icing:
4 Tbs. cocoa
1 cube butter
6 Tbs. milk
4 cups powdered sugar
1 tsp. vanilla
1 cup chopped pecans

Bring to boil butter, cocoa and water. Mix in rest of ingredients. Pour into greased 13x18 cookie sheet. Bake at 350° for 20-25 minutes. Icing: Boil milk, butter and cocoa. Mix in powdered sugar and vanilla. Spread on cake while cake is still warm. Sprinkle with chopped pecans.