Scale and gut the fish, be very careful as the fish will have sharp points.
In a skillet, heat a tablespoon of oil, pan fry the fish under medium-low heat until the fish is nice and crispy. Place the fish in a serving dish, keep warm.
Chop the onion and ginger and add to a pan with 2 tablespoons of oil. Stir-fry till onion is browned.
Add the soy sauce, sugar and sesame oil. Sprinkle some salt.
Pour the caramelized sauce on top of the fish.
Serving Suggestions: Serve with spring onion on the side and some rice.