1. 2 cups White Rice
2. 1/2 cup Grated Coconut.
3. 1/4 cup Beaten Rice
4. 1 cup White portion of the watermelon.

Method:

• Soak rice for 2-3 hrs and grind along with the above mentioned ingredients to a fine paste without  using water.
• Add salt and ferment the batter overnight.The batter should be thick.
• Prepare dosa with lid and cook one side only.                                                        

Note:
                 You can use the juice of the watermelon which is spilled while cutting the fruit. I have used red part too,to enchance the color and taste of the dosa.