Marinate the fish with 1/4 tsp salt on one side. Repeat with the rest of the salt on the other side.
Over medium heat, fry the ginger in cooking oil for 3.5 minutes, or until brown and crispy. Remove all the ginger from the oil.
Fry the garlic for 1.5 minutes, or until crispy and golden brown. Switch off the heat and remove the garlic.
Remove the cooking oil until about 1 tbsp is remaining in the wok.
Switch on the heat to medium. Add in the light soy sauce, sesame oil, water, and 1/2 tbsp of cut chilli to the wok. Stir until combined and let it cook for 1.5 minutes, or until it comes to a boil. Remove from the wok and set aside in a heatproof bowl.
Place the steamer on the stove over medium heat. Add 1.5 litres of water. Cover the steamer and let it come to a rolling boil.
Place the fish on the steamer for 4 minutes.
With a steam clamp, carefully remove the steaming plate. Tilt the plate while supporting the fish with a spatula to drain the excess water into a bowl. Place the fish back into the steamer and discard the water.
Pour the soy sauce mixture, fried ginger strips, garlic and 1/4 tbsp of cut chilli over the fish. Cover the steamer and let it steam for another 3 more minutes.
Switch off the heat. With a steam clamp, carefully remove from the steamer.
Garnish with the rest of the cut chilli and spring onions. Serve.