Soak together the rice, dal and methi seeds for about 3 hours.
Grind the tomatoes in a blender.
To this puree add the soaked rice mix and grind.
Add buttermilk to the grinding instead of water.
Ensure the batter is fine and not grainy.
Remove from blender and mix in chilli powder and salt to taste.
Add water if required to make a dosa consistency batter.
Spread on a hot tawa and cook till crisp like a dosa.
Serve hot with potato bhaji and peanut chutney.