1 1/2 c. butter, softened
3 c. sugar
5 eggs
3 c. flour
1/2 c. cocoa
1 tsp. baking soda
1/4 tsp. salt
1 (8 oz.) carton sour cream
1 c. boiling water
2 tsp. vanilla extract

Cream butter; gradually add sugar, beating well. Add eggs, one at a time, beating well after each addition. Combine flour, cocoa, soda and salt; add to creamed mixture alternately with sour cream, beginning and ending with flour mixture. Add boiling water and mix well. Add vanilla; mix well.

Pour batter into a greased and floured 10-inch tube pan.

Bake at 325°F for 1 hour and 20 minutes or until a wooden pick inserted in center comes out clean. Cool cake in pan 10 to 15 minutes; remove cake from pan and cool completely. Dust with powdered sugar and serve.