Pat the rock cod fillet dry with paper towels. Arrange it on a heatproof plate.
Scatter half of the julienned ginger and pickled mustard greens over the fish.
Steam the fish over high heat for 8-10 minutes, or until cooked through. Cooking time may vary depending on the thickness of the fillet.
Carefully drain any excess liquid from the plate. Scatter the remaining julienned ginger and green onions over the steamed fish.
In a small saucepan, heat cooking oil until smoking hot. Carefully pour the hot oil over the ginger and green onions on the fish to release their aroma.
Drizzle with light soy sauce and sugar mixture (if not already incorporated into the oil) and serve immediately with hot white rice.
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