In a small bowl, mix soy sauce, ginger, garlic, water and oil. Add the fish and turn the pieces over to coat, then set aside for 5 minutes. Place the filets in a steaming basket or steamer. Set over boiling water, cover with lid and steam for about 3 – 5 minutes until the fish is cooked through. Transfer to plates and sprinkle with spring onions, coriander, and Chia seeds. Tip: You can also place the fish in a baking dish and pour the marinade over the fillets, add 2 tbsp water and cover with baking paper and foil then bake in a 180C/350F oven for about 8 – 10 minutes. Uncover and bake about 2 – 3 minutes, until the fish is cooked through.