01 - Set a large cast iron skillet or griddle over medium-high heat and allow it to preheat fully.
02 - Divide the ground beef evenly into 8 balls, about 2 ounces each.
03 - Lay each tortilla flat on your work surface. Center one beef ball on each tortilla and press down, flattening the beef to cover most of the surface.
04 - Once the skillet is hot, place each tortilla with beef facing down onto the cooking surface. Press down firmly with a wide, flat spatula to create a thin patty. Immediately season the beef with a pinch of kosher salt and black pepper.
05 - Sear for 2 to 3 minutes until the beef develops crisp, caramelized edges. Carefully flip each taco so the tortilla is now in contact with the skillet.
06 - Top the hot beef side with a half-slice of cheddar cheese. Cook for 1 additional minute until the cheese is melted and the tortilla is warm and lightly toasted. If desired, add a dab of butter to the skillet for richer flavor.
07 - Remove cooked tacos to a plate and continue with remaining portions until all are cooked.
08 - Layer each taco with lettuce, onion, tomato, and pickles. Drizzle with burger sauce, ketchup, or mustard as preferred. Fold gently and serve immediately while hot.