Heat oil in a wok, on low medium flame add mustard seeds,urad dal,Chana dal then dry red chillis,cumin seeds,green chilli,curry leaves,ginger and onions.Soute it till onions become brown.
Now add turmeric powder, salt,amchur,chilli powder, sambhar masalain in it.Stir.Add roughly crushed potatoes, coriander leaves,mix all the things very well.Transfer it in a plate.Let it cool. Stuffing is ready.
Wash urad dal 2-3 times and soak for 4 to 5 hrs in 1 cup water.Add fenugreek seeds. Wash rice and poha 2-3 times.Soak it in 2 cup water for 4 to 5 hrs.
After 4 to 5 hrs drain all the water from rice and dal.Add little water and grind both the mixture to make a smooth batter.
Take a large bowl transfer both the batter in it.Leave it to ferment for 8-10 hrs or overnight.
Before preparing dosa add salt in it.Mix it well.If batter is too thick, add some water in it.
Heat tawa,grease it with oil,clean it with kitchen napkin or onion slice.Take ladle full of batter and spread it in a spiral motion on tawa from center.
Apply oil around the edges of dosa.Cook for 2-3 minutes on medium heat or till bottom surface turns crispy.
Put potato masala on dosa and fold it.Remove dosa from the tawa.
Serve dosa with coconut chutney / sambhar.Enjoy.
Note— Before spreading the batter, for each dosa,clean the tawa.
