01 - Preheat oven to 400°F or set grill to medium-high heat.
02 - In a small saucepan, whisk together tamari, maple syrup, rice vinegar, sesame oil, minced garlic, and grated ginger until well blended.
03 - In a small bowl, mix cornstarch and water together until smooth, then pour the slurry into the saucepan with the other sauce ingredients.
04 - Place the saucepan over medium heat and bring to a simmer, stirring constantly until the sauce thickens, about 2–3 minutes. Remove from heat and set aside.
05 - Pat salmon fillets dry with paper towels and arrange 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 finishing and serving.
07 - Bake or grill for 10–12 minutes, until the salmon is opaque throughout and flakes easily in the center.
08 - Remove salmon from the oven or grill, drizzle with the remaining teriyaki sauce, and garnish with toasted sesame seeds and sliced spring onions. Serve immediately alongside steamed rice and vegetables.