Mince the fish well. Mix the minced onion, ginger and green chillies along with the egg, broken bread crumbs, lime juice and salt to taste. Make balls the size of a lime each and keep aside when ready to serve, heat about one or one half cup of oil, arrange a few balls, cover the frying pan with a lid for sometime. When the underside is golden, turn the balls. When they are brown evenly, take them out and use them hot, accompanied by potato chips and any sauce.