01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a small saucepan, whisk together tamari, maple syrup, rice vinegar, sesame oil, minced garlic, and grated ginger. Place over medium heat.
03 - In a separate bowl, dissolve cornstarch in water. Stir the slurry into the saucepan and cook, stirring constantly, until the sauce thickens, about 2 to 3 minutes. Remove from heat.
04 - Arrange salmon fillets on the prepared baking sheet, skin side down. Brush generously with the teriyaki sauce.
05 - Bake for 12 to 15 minutes, or until the salmon is just cooked through and flakes easily with a fork.
06 - Remove from oven and brush salmon with any remaining sauce. Sprinkle with sesame seeds and sliced spring onions before serving.