There are some varieties of Dosa that can be made without using urad dal, and here’s one more to add to the list. The recipe was given by my friend from Delhi –
Mix brown rice and whole moong (green gram) in 2:1 proportion. Add a fistful each of methi seeds and channa dal to this mix. Soak the entire mix in water for a couple of hours. Grind well to a dosa batter consistency, and make dosa on a pan instantly. The dosa can be eaten with either chutney or dry chutney powder.