In a small bowl, add lime juice, 1 tbsp olive oil, 1 and ½ tsp taco seasoning, 1 tsp of dill, and salt/pepper to taste. Add flank steak and refrigerate for about 30 minutes.
Heat a cast iron skillet or grill on high and add 1 tbsp of olive oil. Remove the steak from marinade and place it on the hot skillet/grill for about 4-5 minutes then flip and cook another 4-5 minutes for medium rare. Or until desired doneness.
Let steak rest for about 10-15 minutes. Slice in thin slices against the grain and place on the tortillas. Top with feta, lettuce, tomatoes, onions, & jalapenos if desired!