Not sure if you can get Dr. Pepper everywhere but I would guess you could use any cola.
Cake:
1 c butter
2 eggs
1 ½ tsp cinnamon
2 c flour
2 c sugar
4 tbsp cocoa powder
1 c Dr. Pepper
½ c buttermilk
1 tsp soda
1 tsp vanilla
Icing
1/4 c margarine
1/4 c Dr. Pepper
3 tbsp cocoa
1 box powdered sugar
1/2 tsp vanilla
chopped nuts, for garnish
Recipe
Cake:
Heat butter, cocoa and Dr. Pepper. Mix eggs, sugar, buttermilk, soda and vanilla. Add Dr. Pepper combination to dry ingredients. Bake in 8 inch layer pans for 30 minutes and 350 degrees.
Icing
Heat margarine, Dr. Pepper and cocoa until well blended. Stir in remaining ingredients. Frost cake.