Abacus yam ball, tried before? In mandarin it is named as "Suan Pan Zi".My colleauge's husband made some for us. It is delicious, her husband made it so nice. It is made of yam, some mushroom,ham,black fungus, dried shrimp and bean curd cubes, hakka cuisine. Traditionally, this dish is eaten only on the first day of Chinese New Year to symbolize family unity and pr0sperity. But now we get to eat it when we want to. As some hawker centre do sell Yam Abacus .