Ingredients:
Raw rice - 1 cup
Parboiled rice - 1/4 cup
Carrots (grated) - 2 or 3
Red chillies - 4 to 6
Cumin seeds - 1/2 tsp
Onion (cut finely) - 1 big
Tamarind - A small ball
Salt  - To taste.

Method:
1.  Soak the raw and boiled rice together for two to three hours.
2.  Grind it along with red chilies, tamarind and cumin seeds to a fine paste.
3.  Add salt, grated carrots and onions to it.
4.  Heat a tawa and prepare dosas. Roast on both sides.

NOTE: This dosa should be prepared soon after grinding.