In a wide bowl add rava, rice flour and maida together.
Include yogurt and water as needed. Mix well.
This dosa needs the batter to be watery. So include some more water and adjust consistency. Next add cumin seeds, pepper, onion, coriander leaves, curry leaves and salt.
Mix all these and keep the batter aside for 15-20 minutes. Next to prepare masala, heat a pan adding oil, mustard seeds, lentils and curry leaves. Saute till the lentils turn brown.
Next add onion and stir till it turns translucent. Include ginger,mashed potato, turmeric powder and green chillies. Mix and cook for few minutes. Add some water, coriander leaves and squeeze in dash of lemon. Masala for dosa is ready.
The batter after resting might have turned little thick. If so, adjust consistency. Take a ladle full of batter and spill over hot griddle as dosa. Cook it covered till it turns brown. Keep some masala at the center and carefully loosen the dosa to remove.
Crispy rava masala dosa is ready to serve with chutney and sambar.