Season skirt steak with Nolan Ryan Beef steak seasoning. Grill at medium-high heat until internal temperature reaches 145ºF for medium rare or desired doneness.
Remove from grill, slice steak across the grain into .25 inch slices.
Assemble gryo sandwiches, start with steak, add lettuce, onion, tomato, tatziki, cucumber, chickpea, and garnish. Enjoy!