Combine first 6 ingredients in a bowl.
Place salmon on a broiler pan coated with cooking spray; spread each fillet with 1/2 teaspoon mustard. Sprinkle with pepper. Broil 10 minutes or until desired degree of doneness. Let stand 2 minutes. Serve with minted tomato salsa. Garnish with fresh mint, if desired.
Note: Salsa can be made ahead and refrigerated for up to one week.