Plain Kerala Appam is a traditional South Indian dish made from fermented rice batter. It is a soft and fluffy pancake with a slightly sour taste. The batter is prepared by soaking rice and grinding it into a smooth paste. It is then fermented overnight, which gives the appam its unique flavor and texture. The appam is cooked in a special curved pan called an appachatti, which gives it its characteristic shape. It is usually served with coconut milk or a spicy curry.