Grind moong sprouts, ginger and green chillies with a little water to a coarse paste. Add salt, turmeric powder, red chilli powder and sufficient water to make a thick batter.
Heat a non stick tawa. Pour a ladle full of batter and spread to a round dosa. Drizzle a little oil around the dosa and cook till both the sides are evenly cooked.
Serve hot with tomato ketchup.