For dosa
Soak rice ,daal,fenugreek seeds al tovether for 6 hours
After 6 hours straun water grind it in a fine paste
Beat well and keep asid ein a warm place for overnight or 6 to 8 jours for fermentation
Now after fermentation mix it well with hands ...add sugar and salt in it
Keep aside...now make masala
Take a pan heat oil crack mustard ...fry peanuts, add curry leaves and chopped onions along with spices
Saute well now mix chopped beans and mashed potato mix well and cook for 5 minute son low flame by cover a lid
Now make dosa...take a tawa heat it...drizzle oil ...wipe it with a wet towel...now take a laddle full batter and spread on it in a very thin layer.....flame shouldd be on medium...drizzle oil from corners and some drops over it....now place masala on it...and fold it as shown in picture