 It is then mixed with glutinous rice flour slurry and boiled, during which parboiled red beans or black beans may be added.Another common addition is "saealsim" (; literally "bird's egg", named as such due to its resemblance to small bird's eggs, possibly quail eggs), the small rice cake balls made of glutinous rice flour kneaded with hot water.Finally, salt and optionally sugar is added, to taste.