Preheat oven to 375°.
Whisk port, sugar, soy sauce, garlic and ginger in a small saucepan. Set this mixture over low heat and cook until sugar is dissolved. Once cooked, let the mixture come to room temperature and pour one-third of marinade into a resealable plastic bag. Place salmon in the bag and let marinate for at least 20 minutes. Once marinated, drain and discard the used marinade.
Line a rimmed baking sheet with foil and place salmon on baking sheet skin side down. Spoon another third of the marinade onto the salmon and roast for 10 to 12 minutes, until opaque and just cooked through. Once cooked, transfer salmon to a plate and top with the remaining sauce.
Looking for groceries for this recipe? Miya shops locally at Native Sun Jax!