Finely chop the scallions and place them in a bowl. Add a small amount of seasoning powder, sugar, and MSG. Heat cooking oil until very hot, then pour it over the scallions and stir well so the scallions are just cooked.

Spread the banh hoi rice vermicelli sheets on a plate. Brush a few spoonfuls of the scallion oil mixture over each layer for fragrance.

Clean the pork offal thoroughly with salt, vinegar, and ginger wine. Blanch in boiling water for 1 minute, then rinse again.

Place the offal in cold water with a few shallots, some lemongrass stalks, and an onion. Add seasoning powder, a little salt, and some wine. Boil until the offal is cooked through.

Finely mince the garlic and chili peppers. Dissolve sugar in water. Add fish sauce and vinegar, then mix in the minced garlic and chili to make the dipping sauce.