I came across the recipe @ the blog "Cooking is Easy".
1. Dosa Batter 1 cup
2. Mixed vegetables 1/2 cup - I used carrot, cabbage, shallots, coriander leaves (Tomato, capsicum are good options)
Chop the vegetables coarsely. Now grind them well to form a smooth mixture. Add to dosa batter and mix well. Add enough salt. Heat tawa, spread oil and spread the dosa mixture and sim for a minute. Flip and let it cook for a minute. Enjoy with chutneys or tomato sauce.