01 - Heat a large cast iron skillet or griddle over medium-high heat until hot.
02 - Divide ground beef into 8 equal portions (approximately 2 ounces each) and shape into balls.
03 - Place a tortilla on your work surface. Set one beef ball in the center and press down with your hand or a spatula to flatten the meat so it covers most of the tortilla.
04 - Place the tortilla-beef assembly onto the hot skillet, beef side down. Press firmly using a large flat spatula to smash the beef into a thin layer. Sprinkle with a pinch of kosher salt and black pepper.
05 - Cook for 2 to 3 minutes, allowing the beef to become browned and crisp along the edges. Flip so the tortilla faces the skillet. Place a half-slice of cheese atop the cooked beef.
06 - Continue cooking for 1 minute or until the cheese is melted and the tortilla is warm and lightly golden.
07 - Transfer the finished taco to a plate and repeat with the remaining beef and tortillas.
08 - Top each taco with shredded lettuce, sliced onion, tomato, pickles, and a drizzle of burger sauce, ketchup, or mustard as desired. Fold gently and serve immediately.