If using wooden skewers, soak them for 30 minutes beforehand. Heat an outdoor grill and being chopping the ingredients. (Cut steak into pieces, mango and onion.)
Either thread skewers by alternating the ingredients, or put all the ingredients on one skewer which allows ability to remove veggies if done before meat.
Brush the skewers with Italian dressing using a large pastry brush or use hands if needed.
Grill skewers for about 8 minutes per side, checking often to remove vegetables at desired doneness.