1Heat oven to 450°F. Line cookie sheet with cooking parchment paper or silicone baking mat. Place salmon, skin side down, on cookie sheet. Sprinkle with salt and pepper.
2In small bowl, stir syrup, vinegar and garlic with whisk. Brush half of the glaze over salmon.
3Bake 10 minutes. Brush with remaining glaze. Bake 5 minutes longer or until fish flakes easily with fork. Garnish with onions.