Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper for easier cleanup, if desired.

In a mixing bowl, whisk together the soy sauce, maple syrup, rice vinegar, garlic, ginger, and black pepper until well combined.

Place the salmon fillets on the prepared baking sheet, skin side down if applicable. Pour half of the soy-maple glaze over the salmon, reserving the other half for later.

Bake the salmon in the preheated oven for about 12-15 minutes, or until the salmon is cooked through and flakes easily with a fork. An instant-read thermometer should register 145°F (63°C) at the thickest part of the fillet.

While the salmon bakes, you can warm the reserved glaze in a small saucepan over low heat for drizzling later.

Once the salmon is done, remove it from the oven and drizzle it with the warmed glaze. Garnish with sliced green onions and sesame seeds, if using.

For added flavor, let the salmon marinate in the soy-maple mixture for 30 minutes before baking.

Serve with steamed rice or sautéed vegetables for a complete meal.

Leftovers can be stored in an airtight container in the refrigerator for up to 2 days. Reheat gently to retain the salmon's moisture.