Heat 1 T olive oil in skillet until bubbling and then saute onion for five minutes or until soft. Add minced garlic cloves, spices and 1 t salt and saute for another 30 seconds or until fragrant. Stir in the ground beef, breaking it up with wooden spoon until no longer pink, between 5-10 minutes. Set aside.
Prepare salad by placing chopped romaine, diced tomatoes, cubed avocados, red onion and cilantro leaves in a serving bowl. drizzle lightly with olive oil.
Pour the taco meat onto the salad, and generously squeeze quartered limes over the salad and drizzle with olive oil. Season with salt and pepper if needed.