01 - In a small bowl, combine mayonnaise, ketchup, mustard, diced pickles, white vinegar, smoked paprika, and sugar. Stir until fully incorporated, then refrigerate until ready to use.
02 - Divide the ground beef into 8 equal portions and gently roll each into a loose ball without overworking the meat.
03 - Set a large non-stick skillet or griddle over medium-high heat and allow it to come to temperature before adding beef.
04 - Place 2 beef balls on the hot skillet per batch. Lay a flour tortilla over each ball and press firmly with a sturdy spatula until the beef spreads thin across most of the tortilla underside, with the beef side in direct contact with the pan.
05 - Distribute kosher salt, black pepper, and garlic powder evenly over the exposed beef. Cook for 2 minutes, applying occasional pressure, until the edges of the beef turn deeply crisp.
06 - Flip each taco so the tortilla side contacts the pan. Scatter shredded cheddar over the beef and cook 1 additional minute until the tortilla is golden brown and the cheese is fully melted.
07 - Cook the remaining beef balls and tortillas in batches following the same smash, season, flip, and melt process.
08 - Top each prepared taco with shredded iceberg lettuce, diced tomato, finely diced red onion, thinly sliced dill pickles, and a generous drizzle of the chilled burger sauce.
09 - Plate the tacos right away while the beef edges are still crisp and the cheese is hot.