Step 1
Combine cornstarch and 2 tablespoons (30 ml) of water in a small bowl. Whisk together the rest of glaze ingredients in a small saucepan and set over medium heat. Cook, stirring until sauce begins to bubble. Add cornstarch mix and continue stirring until sauce is thickened and translucent, about 1 minute; set aside.
Step 1
Cut salmon into 4 equal portions and dry well with paper towels; sprinkle skin side with salt. Heat vegetable oil in a large frying pan over medium heat. When oil is shimmering, place fillets in pan skin side down. Press down lightly with a spatula and allow to cook 3 minutes.
Step 2
Turn broiler on high and set rack about 8 inches (20 centimetres) below heat source. Line a baking sheet with parchment paper or aluminum foil and place seared salmon fillets on it skin side down. Brush glaze generously over each fillet and set under broiler for 4 minutes. Baste salmon again with rest of glaze and broil until glaze is bubbling and salmon is just cooked through, about 3 more minutes, depending on thickness of salmon.
Step 3
Let rest five minutes and serve with toasted sesame seeds and green onions to garnish.
*Salmon will be cooked to medium when an instant-read thermometer inserted into the centre of the thickest part registers at 125℉ (52℃). If well-done salmon is preferred allow the temperature to reach 135℉ (57℃) before removing from oven.