Vigna mungo, black gram, urad bean, is a bean grown in the Indian subcontinent. The product sold as black lentil is usually the whole urad bean, whereas the split bean (the interior being white) is called white lentil. It is also extensively used in South Indian culinary preparations. Black gram is one of the key ingredient in making the idli-dosa batter, where one part of black gram is mixed with three or four parts of idli rice to make the batter. Also the dough for vada or udid vada is made from soaked batter and deep fried in cooking oil.