Pearl sago and tapioca pearls were introduced to Chinese cuisine via the Hokkien diaspora. Among these are tapioca pearls, which originated as a cheaper alternative to pearl sago. Powdered sago is boiled in water until cooked. It can be made into steamed puddings such as sago plum pudding. To a lesser extent, sources of refined starch are sweet potato, sago and mung bean. The starchy residue is then dried and cooked, producing a starch similar to palm sago/sabudana. The pith contains edible starch, and is used for making sago. Processed starch known as sago is made from this and other cycads. The Yei diet mainly consists of rice, vegetables, fish and roasted sago. Amongst Hindus during fasting, starchy items such as Potatoes, Sago and Sweet potatoes are allowed. Vadai (Vada) may be made from legumes, sago or potatoes. Copra, resin, sago, and fish are important products. Washington grew lemon and orange trees and sago palms there. Sometimes rice may be replaced with sago. Other methods included the use of sago starch.