Bundt cake recipes range from traditional to experimental. This 7-Up bundt cake recipe uses the lemon-lime goodness of 7-up to add a unique flavor. Cream sugar and margarine and beat until light and fluffy. Add eggs one at a time, and beat well. Add flour. Beat in Realemon and 7 Up. Pour batter into well greased and floured Bundt pan. Bake at 325F for 1 1/4 hours.