- Prep the fish: Pat the fillets dry and place them on a heatproof plate that will fit in your steamer. Sprinkle lightly with sea salt. 
- Set up a steamer: Fill a wok or large skillet with 1-2 inches of water. Bring to a simmer. 
- Scatter ginger over the fish. Place the plate with fish into the steamer basket or directly in the wok/skillet (on a trivet above the water). 
- If you don’t have a steamer, you can bake the fish in a parchment packet (en papillote) at 375°F for ~12–15 minutes. 
- Steam gently for 8–10 minutes (depending on thickness) until the fish flakes easily. 
- Finish: Remove from the steamer. Drizzle with coconut aminos and a touch of sesame oil, then sprinkle with scallions. 
- Serve immediately with lemon or lime wedges.