Preheat oven to 375 degrees F (190 degrees C). Grease a 15×10 inch jelly roll pan.
Bring 1 cup butter, water and 4 tablespoons cocoa to a boil in a large saucepan. While still hot, remove from heat and add 2 cups flour, 2 cups white sugar, and salt. Mix well. Beat in eggs, sour cream, and baking soda.Do not beat too long.
Pour batter into greased 15×10 inch jelly roll pan. Bake at 375 degrees F (190 degrees C) for 20 to 25 minutes, or until a toothpick inserted into center of cake comes out clean.
To Make Icing: Bring 1/2 cup butter or margarine, 4 tablespoons cocoa and5 tablespoons milk to a boil. Remove from heat. While still hot, add confectioners’ sugar vanilla and nuts. Beat well. Ice cake while icing is still hot.
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