Preperation :

Take 1tbsp Soya sauce, 1tbsp corn flour, salt  & pepper in a bowl and form a mixture. 
Cover fish pieces with the above mixture evenly.
Heat oil in a wok / kadhai and deep fry the fish pieces till golden brown.
Now heat 2 tbsp oil in a separate pan and add ginger paste, onions, pepper, salt and ajinomoto. Sauté for a minute.
Add chicken broth,  remaining Soya sauce and corn flour, sugar and vinegar and bring to boil.
Dissolve corn flour in a 1/2 cup water and add to the curry stirring constantly to avoid lumps.
Add fried fish pieces. Simmer for a minute or two.
Serve hot with steamed / boiled rice.