Sprinkle 1 fish fillet per serving with 1/2 teaspoon ginger and place on a plate. Drizzle with 2 teaspoons soy sauce and 1/4 teaspoon sesame oil and scatter 1 tablespoon scallions on top. Place plate on steamer rack over boiling water and cover. Steam 5 minutes or until fish is cooked through. Remove plate from steamer and garnish with cilantro sprigs.