A vadai (alternatively vada, wada, vade) is a savoury South Indian snack shaped like a doughnut and made from lentil or potato.Vada can vary in size and shape, though most are comparable to the Westerndoughnut.Mashed or diced potatoes and/or lentils are seasoned — sometimes sauteed — then shaped, covered in a gram flourbatter and deep-fried.Although battered and deep-fried, the finished product should not be too oily if prepared correctly.Served in a bun with fresh spice/sweet chutney, a vada becomes a vada pav, a street food like the hot dog.