01 - Set a large cast iron skillet or griddle over medium-high heat and allow to preheat thoroughly.
02 - Divide ground beef into 8 equal balls, approximately 2 ounces each, ensuring even portions.
03 - Place a flour tortilla on the work surface. Position a beef ball in the center and press flat using your hand or a spatula to cover most of the tortilla.
04 - Arrange tortilla and beef assembly, meat-side down, onto the hot skillet. Smash the beef firmly with a flat spatula into a thin layer. Season with salt and black pepper.
05 - Cook 2 to 3 minutes until beef is deeply browned and crisp at the edges. Flip so the tortilla faces the skillet. Top each with a half-slice of cheddar cheese. Cook 1 additional minute to warm the tortilla and melt the cheese.
06 - Transfer to a plate and repeat the process with remaining tortilla-beef assemblies.
07 - Top each taco with shredded lettuce, sliced onion, tomato, pickles, and a drizzle of burger sauce, ketchup, or mustard. Fold gently and serve hot.