Heat oil and add mustard seeds.
Add ginger garlic paste and saute.
Add onion and stirr.
Add tomatoes and wait till it turn mushy.
Add seasoning n spices and mix well.
Add mash potato and salt.
Cover for a minute.
Add capsicum and cook for another 2 minutes.
Add pinch of sugar,peanuts, coariander leaves and garnish .
Serve hot with pav , you use it to make dabeli.