Place the trout fillets side by side on a foil and spread lemon rind, chili flakes, garlic and ginger over them. Pour lemon juice and spread out the pieces of pak choi over the trout fillets.

Now pour soy sauce over the pak choi and seal the foil to make a package. Make sure that you leave a little space at the top of package for the steam to circulate whilst the trout fillets are being cooked.

Steam the trout fillets for 10-12 minutes. You may use a steamer for cooking the fish. Else, place the fillets on a heatproof plate over a pan of gently simmering water. Cover the plate with a lid and steam.