buttermilk,or sour milk ( see variations )
pecans ( optional ),chopped
Sift the flour,sugar and baking soda together into a large bowl.
Heat the butter,1 cup of cola and cocoa powder in a small saucepan until smooth and just beginning to boil. Whisk into the flour mixture.
Whisk the buttermilk,eggs and vanilla together and stir into the flour mixture to form a smooth batter. Finally fold the marshmallows into batter.
Pour into a greased 13x9-inch cake pan and bake for 30 - 40 minutes.
While cake is baking,add the remaining 6 tablespoons of cola,4 tablespoons of butter and 3 tablespoons of cocoa powder to a small saucepan and bring to a boil over medium heat.
Remove from heat and beat in the powdered sugar until smooth.
Stir in the pecans ( if you chose this option )
Spread the frosting evenly over the cake as soon as it finishes baking. The cake must be hot when the frosting is spread.
Set aside to cool completely,then slice and serve.
VARIATIONS: Sour milk can be made by adding 2 teaspoons of lemon juice to 1 cup of milk. Let set for about 10 minutes before adding to recipes.