Wash karelas thoroughly and using a piller ,scrape the skin.
Take a bowl ,add karelas ,sprinkle with some salt and keep aside for a one hour.
After one hour wash karelas with fresh water and drain extra water. if the seeds ripened then remove,otherwise don’t remove the seeds.
Take a pan ,add oil, grated onion in it.saute it for 5-6 min.
Add all spices and saute it for 5 min.keep it aside and let it cool down.
Take a wok.
Add oil in it,when the oil heats up then deep fry the kareles ,until its become golden fry.
Take out the kareles and keep it on tissue paper, when it cools down add onion masala in it, take a green chillies, small onion ,cut into center and fill the onion masala in it .
Take a another wok.
Add 2 tbsp oil , sliced onion,potato in it,saute it for 7-8 min when the potatoes are cooked properly.
Add salt ,red chilli powder, haldi powder,amchoor powder according to your taste and mix well.
Add stuff kareles, green chillies, small onion in it.
Cover the kareles ,and cook at low flame for 5-6 min,so that the kareles becomes soft.