Bora saul

Bora saul is a variety of glutinous rice found in Assam. It has an important role in Assamese traditional occasions like Bihu. It is used in Jolpan (snacks) and Pitha (rice cake or pancake). Soaked and ground bora saul is used in preparing Pitha. Boiled bora saul is served as Jolpan with curd or milk, jaggery or sugar. Some people use bora saul to make simple boiled rice, which is very delicious, but sticky in texture. During the Ahom reign in Assam, bora saul with duck-egg was used in constructing buildings because of its sticky quality.

...
Wikipedia