Chinese-style steamed fish

Ingredients
1 threadfin or senangin ( 350g )
1 tomato ( cut lengthwise into 8 pieces)
100g carrot ( shredded)
2 cm ginger ( shredded )
100g spring onions ( cut into two portions - first portion ( cut into 2cm length )for steaming , second portion(cut into small pieces) for garnishing
1/2 chilli ( cut into thin slices)
1 tsp light soya sauce
1/2 tsp black vinegar
1 tbsp shallot oil (1 sliced shallot stir-fried in 1 tbsp oil)
some salt

Preparation
1. Make three diagonal cuts on both sides of the fish with a sharp knife.
2. Rub salt on the whole fish including the stomach.
3. Place the fish in a deep plate. Put in carrot, ginger, tomato and spring onions( the first portion).
4. Mix vinegar, light soya sauce and shallot oil together and pour over the fish.
5. Steam over high flame for 15 minutes.
6. Garnish with the second half portion of spring onions and chilli.
7. Serve hot.