Place the fish on a heatproof plate that can fit in your stockpot or wok. Mix together the soy sauce and sesame oil and drizzle over the fish. Pour 2 inches of water into your stockpot or wok and bring to a simmer. Place a steamer rack inside, making sure the water does not touch the steamer in the wok or on the rim of the stockpot. Make sure the water does not touch the bottom of the steamer.
Place the plate with the fish in the steamer, cover the pot or woke, and steam for 8-10 minutes, until the fish flakes easily when tested with the tip of a knife.
Carefully remove the plate from the steamer and pour off any liquid. Top with with the cilantro and serve.