Toppings: Guacamole chopped green onion grated cheddar cheese shredded lettuce

Preheat grill for 10 minutes. In large cast iron skillet or frill safe baking dish, combine ground beef and onion. Cook and stir at high with hood open until beef is no longer pink, 10-12 minutes. Drain. Stir in olives, cumin, salt, garlic powder and pepper. Place taco shells on upper cooking rack. Cook meat mixture with hood closed for about 5 minutes longer. Stir in tomato. Reduce heat setting to low and serve from grill with toppings.