Whisk scallion, soy sauce, vinegar, honey and ginger in a medium bowl until the honey is dissolved. Place salmon in a sealable plastic bag, add 3 tablespoons of the sauce and refrigerate; let marinate for 15 minutes. Reserve the remaining sauce.
Preheat broiler. Line a small baking pan with foil and coat with cooking spray.
Transfer the salmon to the pan, skinned-side down. (Discard the marinade.) Broil the salmon 4 to 6 inches from the heat source until cooked through, 6 to 10 minutes. Drizzle with the reserved sauce and garnish with sesame seeds.
Tips: How to skin a salmon fillet: Place skin-side down. Starting at the tail end, slip a long knife between the fish flesh and the skin, holding down firmly with your other hand. Gently push the blade along at a 30° angle, separating the fillet from the skin without cutting through either.
To toast sesame seeds, heat a small dry skillet over low heat. Add seeds and stir constantly, until golden and fragrant, about 2 minutes. Transfer to a small bowl and let cool.
People with celiac disease or gluten-sensitivity should use soy sauces that are labeled "gluten-free," as soy sauce may contain wheat or other gluten-containing sweeteners and flavors.
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