Coca Cola Cake

2 cups flour
2 cups sugar
2 sticks margarine
3 tbsp. cocoa
1 cup coke
1/2 cup buttermilk
2 beaten eggs
1 tsp. soda
1 1/2 cup mini marshmallows
1 tsp. vanilla 

Combine flour and sugar. Heat butter, cocoa and coke until it boils. Pour over sugar and flour mixture, mixing well. Add milk, eggs, soda, vanilla and marshmallows. Beat well. Pour into greased and floured pan. Bake at 350 for 30 to 40 minutes. Ice while hot.