This is a rice cake, it tastes the best when the rice is freshly made. The do-ahead would be to cook the rendang and to soak the rice the night before. I steamed the rice on the morning of the celebration and prepared the cake decoration items. Together with the nicely warmed up rendang, I assembled the cake in less than 20 minutes. If there are any leftovers, these should be stored like any rice and curry dishes and kept in the fridge, best consumed by the following day.