Glutinous rice is divided into long glutinous rice and round glutinous rice. Long glutinous rice tastes soft and waxy, so it is not suitable for porridge. Round glutinous rice is short and round in shape, sweet and greasy in taste, and weaker in viscosity than long glutinous rice, which is very suitable for cooking sweet porridge. Only by soaking in cold water for at least 1 hour before cooking will the cooked porridge have a bright luster.