Gremolata, a zesty Italian garnish traditionally made of minced parsley, lemon rind, and garlic, is simple to prepare and great for adding a burst of fresh flavor to a variety of dishes. Here, we've substituted orange rind for the lemon rind. Serve with mashed sweet potatoes.
Sprinkle steak with salt and pepper. Place steak and onion wedges on a grill rack coated with cooking spray. Grill 5 minutes on each side or until desired degree of doneness. Let stand 5 minutes. Cut steak diagonally across grain into thin slices.
While steak grills, combine balsamic vinegar and shallots in a small saucepan. Bring to a boil; reduce heat, and simmer 7 minutes or until reduced to 1/4 cup. Drizzle balsamic mixture over steak slices, and sprinkle with Orange Gremolata.