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, minced garlic, and grated ginger until well combined.
03 - In a small bowl, mix the cornstarch and water together until completely smooth, then pour the slurry into the saucepan with the sauce base.
04 - Place the saucepan over medium heat and bring the mixture to a gentle simmer, stirring continuously until the sauce thickens, about 2–3 minutes. Remove from heat and set aside.
05 - Pat the salmon fillets thoroughly dry with paper towels and arrange them on a parchment-lined baking sheet or a lightly oiled grill tray.
06 - Using a basting brush, coat each salmon fillet generously with the teriyaki sauce, making sure to reserve some sauce for finishing and serving.
07 - Bake or grill the salmon for 10–12 minutes, or until the flesh is opaque throughout and flakes easily when tested with a fork in the center.
08 - Remove the salmon from the oven or grill and drizzle with the remaining teriyaki sauce. Sprinkle with toasted sesame seeds and sliced spring onions if desired.
09 - Serve immediately alongside steamed rice and your favorite vegetables for a complete, satisfying meal.