@ RupayHalwa: Fish is good for my parents but I won't experience it after reading your own opinion about it. lol
You can make a nice fish filling for samosas with grilled/baked soft white fish like mahi-mahi or tilapia mixed with little chunky mashed potatoes (it acts as a good binder), scalions, and cilantro.
You can also make a nice fish filling with grilled/baked fish (use some white fish like tilapia and don't over cook the fish), finely sliced cabbage, cilantro, finely sliced carrots, finely chopped green onions. Samosas or rolls with this filling would taste really good.