How to Make It
To prepare steak, combine first 7 ingredients; rub evenly over steak. Cover and refrigerate 2 hours or overnight.
Prepare grill or broiler.
To prepare salsa, combine red onion, 2 tablespoons juice, and 1/2 teaspoon salt, tossing to coat. Let stand 30 minutes. Combine mango and next 7 ingredients (mango through jalapeño) in a medium bowl. Add onion mixture; toss gently to combine.
Place steak on grill rack or broiler pan coated with cooking spray; cook 6 minutes on each side or until desired degree of doneness. Place steak on a platter; let stand 5 minutes. Cut diagonally across grain into 1/4-inch-thick slices. Serve with salsa.