Cream together the butter and both sugars; add eggs and beat for one minute. Add buttermilk alternately with the flour mixture to the egg mixture. Pour batter into two well greased and lightly floured 20 cm round pans. Bake in preheated 350 oven for 30-35 minutes. sour milk to 1 cup of sweet milk add 1 T vinegar and let sit for 5 minutes. * Caramel Frosting: combine 1 cup sugar, 1 cup firmly packed brown sugar and two third cup sour cream in sauce pan. Cook to soft ball stage 234. Remove from heat and cool to lukewarm,110f. Add 1 tsp vanilla beat until thick enough to spread. Thin with small amount of cream if necessary. Pat Dwigans ----