Drain and grind smoothly rice and toor dal with chopped tomatoes, dried red chilies, grated coconut, jaggery, salt, and a little water to batter-like consistency.
Heat a non-stick tava (griddle) on high flame till hot. Reduce heat, pour a ladle full of batter, and spread it evenly making circles to form a dosa.
Drizzle with some water along the edges.
Cook on medium heat to high flame for a few seconds. Flip to other side and cook for 20-30 seconds.