Place pineapple, onion, chiles, garlic, 1 ½ tablespoons MAGGI® Seasoning Sauce and salt in a blender; cover. Blend for a few seconds; set aside.
Combine steak, nopales, onions, tomatoes, remaining 2 tablespoons MAGGI® Seasoning Sauce and Worcestershire sauce in a shallow dish. Cover with plastic wrap and marinate for 30 minutes in the refrigerator.
Spread a little pineapple salsa on the meat. Add oil to a grill pan and heat over medium heat. Add steak and vegetable mixture and cook until meat is done. Serve with tortillas and remaining pineapple salsa.