Grind the ginger, garlic, green chilies and onion to make a paste. Pat dry the fish in paper towels. Mix salt & turmeric powder with the ground paste and coat the fishes evenly with this. Set aside for an hour.
In the mean time roast the sesame seeds in a heavy pan. Set aside.
Heat oil in a pan and shallow fry the marinated fish until crisp. Sprinkle the roasted sesame seeds on top it and garnish with chopped cilantro leaves. Serve hot with slices of lime.