Preheat oven to 325°F.

In a mixing bowl, soft together the flour and sugar. Set it aside.

Melt the butter in a saucepan. Stir in the cocoa and Coca-Cola, and brig to a boil. Remove from heat.

Pour the liquid mixture over the flour and sugar. Add the buttermilk, baking soda, vanilla, marshmallows, and eggs. Stir well.

Pour the mixture iro a greased 9x13 pan. Bake for 30 min. Remove fr on oven and ice while hot.

Melt the butter. Stir in the cocoa as Coca-Cola remove from heat.

Add the confectioners' sugar, vanilla, and pecans. Stir well.

Pour icing over hot cake.