Lively citrus flavors and piquant seasonings combine to create this Cuban influenced marinade for steak.
Mix all ingredients, except steak, in small bowl. Place steak large resealable plastic bag or glass dish. Add marinade; turn to coat well.
Refrigerate 30 minutes or longer for extra flavor. Remove steak from marinade. Discard any remaining marinade.
Grill over medium-high heat 6 to 8 minutes per side or until desired doneness.
Grill onion slices and serve over steak.