01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease it.
02 - Pat salmon fillets dry with paper towels and season both sides evenly with salt and black pepper. Arrange fillets skin-side down on the baking sheet.
03 - Combine orange juice, honey, soy sauce, vinegar, grated ginger, minced garlic, and orange zest in a small saucepan. Simmer over medium heat for 4 to 5 minutes, stirring occasionally, until glaze thickens slightly. Remove from heat.
04 - Brush each fillet generously with the prepared orange glaze, reserving some glaze for serving.
05 - Bake fillets in the preheated oven for 12 to 15 minutes, until salmon is just cooked through and flakes easily. Target internal temperature is 125–130°F for medium doneness.
06 - Remove from oven, brush with additional glaze, and sprinkle with green onions and toasted sesame seeds if desired. Serve immediately garnished with orange slices.