You can use any white flesh fish like lapu-lapu (grouper) or maya-maya (red snapper).
Clean the fish by removing the scales, gills and innards. Wash in running water and drain.
Cut slits on the sides and rub with rock salt. Put the ginger inside the fish.
Deep fry until golden brown. Set aside. Fry garlic, onion and sweet pepper for a few minutes.
Then combine water, vinegar, soy sauce and cornstarch.
Then add the fried garlic, onion and sweet pepper and boil for 3 minutes until it becomes a medium thick gravy. Season with MSG
Place the fish on a platter and pour the gravy over it and garnish with parsley and onions. Serve hot.