FOR THE CAKE:

2 c. granulated sugar
2 c. all-purpose flour
1 1/2 c. miniature marshmallows
1/2 c. (1 cube) butter, plus extra for pan
1/2 c. vegetable oil
3 tbsp. unsweetened cocoa
1 c. Coca-Cola
1/2 c. buttermilk
1 tsp. baking soda
2 eggs
1 tsp. vanilla

In a bowl, sift sugar and flour. Add marshmallows. In a saucepan, mix butter, oil, cocoa and Coca-Cola. Bring to a boil and pour over dry ingredients; blend well. Add buttermilk, baking soda, eggs and vanilla, mixing well. Pour into a well-greased 9x13 inch pan, and bake in a preheated 350 degree oven for 45 minutes. Remove from the oven and frost immediately.

FROSTING:

1/2 c. (1 cube) butter
3 tbsp. unsweetened cocoa
6 tbsp. Coca-Cola
1 (16 oz.) box powdered sugar
1 tsp. vanilla
1 c. chopped pecans

Combine butter, cocoa, and Coca-Cola in a saucepan. Bring to a boil and pour over powdered sugar, blending well. Add vanilla and pecans. Spread over hot cake. When cool, cut into squares and serve.