Wash the tomatoes, grate them dry and quarter them. Remove the core and stalk and roughly dice the flesh. Wash spring onions, shake dry and cut into rings, slightly diagonally. Clean the chilli, cut lengthwise, wash and remove the seeds. Cut the pod into small pieces. Peel carrot and cut into fine strips. Clean zucchini and cut into fine strips.
In a bowl mix tomatoes, spring onions, chilli, carrot and zucchini. In another bowl for the marinade, mix soy sauce, fish sauce, spice mixture and squeezed lime juice.
Wash fish cold and pat dry. Place 4 pieces of aluminium foil (approx. 30 cm long) on the work surface. Place one piece of fish in the middle of each. Spread the vegetable mix evenly on the fish.
Fold aluminium foil, not too tight, into airy packets and close them tightly. Grill on the hot grill for about 15 minutes.
Wash coriander, shake dry, pluck leaves from the stems and cut coarsely. Remove the aluminium packet from the grill, open, season with the marinade, salt and pepper and serve immediately. Sprinkle the fish on the plate with coriander - and enjoy.