Soak rice and dal for overnight.

Drain the water and add in a grinder and make a batter.

Take rest for batter for 7-8 hours.

Heat oil in a wok add green chilli and saute it,now add onion and saute till golden in colour add tomato and cook for 2-3 minutes.

Add all ingredients in a mixer and make a paste for chutney.

Grease oil on tava pour dosa batter and make a dosa,shallow fry till golden in colour,fill potato mixture and wrape.

Serve with chutney and sambar.