Coca~Cola Cake

2 cups flour
2 cups sugar
2 sticks margarine
1 cup Coca-Cola
1/2 cup buttermilk
2 eggs
1 tsp. baking soda
1 tsp. Vanilla
3 Tbsp. cocoa
1 1/3 cup miniature marshmallows
ICING:
1/2 cup butter (1 stick)
6 Tbsp. Coca-Cola
3 Tbsp. cocoa
1 lb. box powdered sugar
1 cup pecans, chopped

CAKE: Combine flour and sugar. Heat margarine and Coca-Cola to boiling point; pour over flour mixture. Mix well. Add buttermilk, eggs, baking soda, vanilla, cocoa, and marshmellows. Pour into greased cake pan. Bake at 350 degrees for 35 minutes. ICING: Combine butter, Coca-Cola, and cocoa. Heat mixture, pour over powdered sugar. Use more or less powdered sugar as needed. Beat well. Ice cake while cake is still hot. Sprinkle chopped nuts over cake.