Step 2

Scatter the julienned ginger, the diced garlic, the chili and the lime zest over the fish, then squeeze the lime juice across them.

Step 3

Tuck the halved bok choy around and over the fillets, then pour the soy sauce over the greens rather than the fish.

Step 4

Bring the edges of the foil together and fold them into a loose seal, leaving a pocket of air above the fish so the steam can circulate inside.

Step 5

Steam the parcel for 15 minutes. Without a steamer, sit it on a heatproof plate over a pan of barely simmering water and cover with a lid.