Rinse the threadfin fillet/fish and pat dry thoroughly with paper towels. Make a few diagonal slits on the thickest part of the fish if using a whole fish.
In a small bowl, combine preserved olive leaves, minced garlic, minced ginger, light soy sauce, sugar, and white pepper. Mix well.
Place the fish on a heatproof plate. Spread the olive leaf mixture evenly over the top of the fish.
Bring water to a boil in a steamer. Once boiling, place the plate with the fish into the steamer.
Steam for 8-12 minutes for a fillet or 10-15 minutes for a whole fish (depending on thickness), until the fish flakes easily with a fork.
Carefully remove the plate from the steamer. Heat cooking oil in a small pan until smoking hot. Pour the hot oil over the fish and olive leaf mixture.
Garnish with sliced green onions and serve immediately with rice.
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