This dish is fast enough to be the backbone of a weeknight meal, but it is truly elegant. The quick cooking method combined with a simple sauce allows the delicate flavor of the fish to come through. If cooking a whole fish, it will serve only 2 to 3 people, whereas fish steaks, because they are all meat, will feed 4.
Combine in a small bowl:
Place on a heatproof plate just large enough to hold them:
Cut 2 or 3 slashes in each side of the fish if using whole fish. Pour the sauce over the fish. Scatter over the fish:
If desired, cover the fish and marinate in the refrigerator for up to 2 hours. When you are ready to cook, place a rack in the bottom of a large pot (or use a bamboo steamer). Place the fish, still on the plate, on the rack or in the steamer, cover the pot, and bring the water to a boil. Steam until the fish is cooked through, 10 to 12 minutes for thick steaks, 12 to 15 minutes for whole fish, or until the internal temperature reaches 130°F. Serve the fish with the accumulated juices.