01 - Preheat your oven to 400°F or set your grill to medium-high heat.
02 - In a small saucepan, whisk together the tamari, maple syrup, rice vinegar, sesame oil, garlic, and ginger until well combined.
03 - In a small bowl, mix the cornstarch and water until smooth and free of lumps. Pour the slurry into the saucepan with the sauce base.
04 - Bring the sauce to a simmer over medium heat, stirring constantly until it thickens to a glossy glaze, about 2–3 minutes. Remove from heat and set aside.
05 - Pat the salmon fillets dry with paper towels and arrange them on a parchment-lined baking sheet or a lightly oiled grill tray.
06 - Brush each salmon fillet generously with the teriyaki sauce, making sure to reserve some sauce for serving.
07 - Bake or grill the salmon for 10–12 minutes, or until the flesh is opaque and flakes easily in the center.
08 - Remove the salmon from the oven or grill, drizzle with the reserved teriyaki sauce, and garnish with toasted sesame seeds and sliced spring onions. Serve immediately with steamed rice and vegetables.