Using a potato peeler, peel off the knobbly ridges of the karela and discard. Slit part way along one side, scoop out and discard the seeds.
Thinly slice karela into rounds.
Heat the oil on high heat. Add methi seeds and fry quickly taking care not to burn.
the karela discs and cook until some of the karela discs start to get brown on the edges.
Lower the heat to medium, add the sliced onions,garlic, chilli (and diced boiled potatoes if using).
Add salt to taste.
Cook stirring occasionally for 20mins or until the onions and karela slices are brown and crispy.
Serve hot or at room temperature with dahl, rice and tamarind chutney or with roti.