Heat oil in a frying pan over medium heat. Add onions and fry till golden. Remove and drain on absorbent paper.
Peel the bananas and potatoes and mash well.
In a mixing bowl, combine mashed banana, potatoes with browned onions, ginger garlic paste, chopped coriander, chilli powder, gram flour, cardamom powder and salt an dmix throughly.
Fill this mixture into a cleaned hollow capsicum and stuff well. Using a sharp knife capsicum horizontally into - 2 inch thick slices.
Heat ghee in a frying pan, and shallow fry the stuffed capsicum slices till the capsicum softens slightly and filing id golden and crisp.
Remove, drain on absorbent and serve hot with coriander chutney.