After cleaning, make three diagonal cuts on each side of the fish. This helps the sauce penetrate the flesh evenly and ensures tender, flavorful bites.
Place the bashed white lemongrass stalks into the cavity of the fish. This infuses the fish with a fragrant citrus aroma while steaming.
Place the fish on a plate or tray over the steamer/trivet. Steam on medium-high for 8–10 minutes, until the flesh is opaque and flakes easily. Avoid overcooking.
Step 4: Prepare the coconut lemongrass sauce
In a small pot, bring broth and coconut milk to a simmer. Add chopped garlic, chilies, and coriander stems. Stir in palm sugar, fish sauce, and lime juice without boiling the lime to preserve its bright flavor.
Pour the hot sauce over the steamed fish. Garnish with fresh coriander leaves and a few extra chili slices for a colorful, aromatic presentation.