Indonesia cuisineLontong is traditionally made by partly cooking the rice and packing it tightly into a rolled-up banana leaf. The leaf is then secured and cooked in boiling water for about 90 minutes. Once it is cooled, the rice compacts and can be cut up into bite-sized pieces.lontong (rice steamed in banana leaves).Lontong opor,lontong serve with opor soup.Opor soup is made from coconut milk with some spices.