Combine whole-wheat flour, wheat rava and rice flour in a medium size mixing bowl. Add 3 cups of water. Mix well to form a smooth batter. Set aside for at least 30 minutes.
When ready to cook, heat a tawa or griddle on medium-high flame.
Add cumin seeds, veggies (if using) and salt. Mix well and add more water if needed to make a pourable batter.
Ladle batter onto the hot griddle and spread it around using the back of the ladle into a round dosa.
Drizzle 1~2tsp oil on the dosa and cook until golden brown on both sides, about 2~3 minutes per side.
Serve hot with chutney and/or curry.