To prevent tuna from being fishy, soak it in a solution of 20g salt per 1 liter of water for 1 hour to let the blood drain.
When frying the pickled mustard greens, stir-fry on high heat for about 2 minutes to make them more resilient and prevent them from breaking apart during long cooking.
Use good quality pickled mustard greens for the best flavor.
Using 'Sếp Và Quốc' brand fish sauce eliminates the need for additional seasoning powder.