Make the marinade
In a bowl, whisk together soy sauce, honey, sesame oil, minced garlic, and fresh ginger until smooth.
Marinate the salmon
Place the salmon fillets in a shallow dish or zip-top bag. Pour about half of the marinade over the salmon, turning the fillets so they are coated. Cover and refrigerate for at least 15 minutes.
Prepare the oven
Preheat the oven to 375°F. Line a baking sheet with parchment paper, foil, or a silicone baking mat for easy cleanup.
Arrange the salmon
Place the salmon fillets on the prepared baking sheet, skin-side down if the skin is still attached. Let any excess marinade drip off before baking.
Bake until flaky
Bake for 15 to 20 minutes, depending on the thickness of the fillets. The salmon is ready when it flakes easily with a fork and reaches 145°F in the thickest part.
Reduce the glaze
While the salmon bakes, pour the unused marinade into a small saucepan. Bring it to a boil, then reduce the heat and simmer for 3 to 5 minutes, until slightly thickened and glossy.
Glaze and finish
Spoon the warm glaze over the baked salmon. Garnish with green onions and sesame seeds if desired.
Serve warm
Serve immediately with rice, steamed vegetables, noodles, or your favorite fresh side dish.