1. Turn on broiler, if using, and cover broiler pan with aluminum
foil.
2. Mix the vinegar, mustard, maple syrup and pepper to taste in a
large bowl.
3. Wash and dry the salmon, and place in the marinade, turning to
coat.
4. Prepare stove-top grill, if using. Grill salmon on both sides,
following the Canadian rule: measure salmon at thickest part and cook
8 to 10 minutes to the inch.
5. Peel and cube mango; heat the remaining marinade until it boils.
6. When salmon is cooked, top with heated marinade and mango and
serve.