Bora saul is a variety of glutinous rice

Glutinous rice

Glutinous rice is a type of short-grained Asian rice that is especially sticky when cooked. It is called glutinous Glutinous rice (Oryza sativa var. glutinosa or Oryza glutinosa; also called sticky rice, sweet rice, waxy rice, botan rice, biroin chal, mochi rice, and pearl rice, and pulut) is a...

 found in Assam

Assam

Assam , also, rarely, Assam Valley and formerly the Assam Province , is a northeastern state of India and is one of the most culturally and geographically distinct regions of the country...

. It has an important role in Assamese

Assamese language

Assamese is the easternmost Indo-Aryan language. It is used mainly in the state of Assam in North-East India. It is also the official language of Assam. It is also spoken in parts of Arunachal Pradesh and other northeast Indian states. Nagamese, an Assamese-based Creole language is widely used in...

 traditional occasions like Bihu

Bihu

Bihu denotes a set of three different cultural festivals of Assam and celebrated by the Assamese diaspora around the world. Though they owe their origins to ancient rites and practices they have taken definite urban features and have become popular festivals in urban and commercialized milieus in...

. It is used in Jolpan

Jolpan

Jolpan, or snacks, are often served at breakfast in the Cuisine of Assam, although they may also be served at Bihu festivals or weddings. The word jolpan includes all the preparations namely jolpan, pitha, laddu and tea...

 (snacks) and Pitha (ricecake or pancake

Pancake

A pancake is a thin, flat, round cake prepared from a batter, and cooked on a hot griddle or frying pan. Most pancakes are quick breads; some use a yeast-raised or fermented batter. Most pancakes are cooked one side on a griddle and flipped partway through to cook the other side...

). Soaked and ground bora saul is used in preparing Pitha. Boiled bora saul is served as Jolpan

Jolpan

Jolpan, or snacks, are often served at breakfast in the Cuisine of Assam, although they may also be served at Bihu festivals or weddings. The word jolpan includes all the preparations namely jolpan, pitha, laddu and tea...

 with curd

Curd

Curds are a dairy product obtained by curdling milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. The increased acidity causes the milk proteins to tangle into solid masses, or curds. The remaining liquid, which contains only...

 or milk

Milk

Milk is a white liquid produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals before they are able to digest other types of food. Early-lactation milk contains colostrum, which carries the mother's antibodies to the baby and can reduce the risk of many...

, jaggery

Jaggery

Jaggery is a traditional unrefined non-centrifugal whole cane sugar consumed in Asia, Africa, Latin America, and the Caribbean. It is a concentrated product of cane juice without separation of the molasses and crystals, and can vary from golden brown to dark brown in color...

 or sugar

Sugar

Sugar is a class of edible crystalline carbohydrates, mainly sucrose, lactose, and fructose, characterized by a sweet flavor.Sucrose in its refined form primarily comes from sugar cane and sugar beet...

. During the Ahom

Ahom kingdom

The Ahom Kingdom was a medieval kingdom in the Brahmaputra valley in Assam that maintained its sovereignty for nearly 600 years and successfully resisted Mughal expansion in North-East India...

 reign in Assam

Assam

Assam , also, rarely, Assam Valley and formerly the Assam Province , is a northeastern state of India and is one of the most culturally and geographically distinct regions of the country...

, bora saul with duck-egg was used in constructing buildings because of its sticky quality.