Heat oil in a heavy bottomed pan,add mustard and cumin seeds wait till it flutters, then add green chilli,curry leaves,asafoetida and wait one more minute.
Now add onion and tomato,pinch of salt and wait for 2minutes.
Add turmeric,red chilli powder, cumin powder,coriander powder,masala powder and wait one more minute.
Now add slightly mashed potato,green peas, water and salt. Mix it well and boil.
Wash soaked rice and grind with Honedew melon into smooth batter. Don't add water while grinding.
Take a ladle full of batter in a heating bowl, add a cup of water
and heat it for 5-10mins to prepare pulp of it. Let is cool down. Add it to the batter.
Then add salt and jaggery, mix it well. Right, batter is ready now.
Heat the dosa pan, apply oil, take a spoon full of batter and thinly spread.Cover it with lid and cook it for minute in medium flame.