While we love a grilled burger, this one is our go-to for all seasons. Instead of making a typical patty, we smash the meat in a super-hot cast-iron pan to get crispy, ruffled edges. Once you smash your burgers this way, you'll never go back! We top them with all the fixings, including our perfectly balanced special sauce. It's what we consider an iconic burger.
Combine the mayonnaise, ketchup, mustard, relish and vinegar in a small bowl; set aside.
Working in batches if necessary, add the bacon to a large cast-iron skillet over medium heat. Cook, flipping halfway through, until crisp and golden, about 10 minutes. Transfer the bacon to a nonstick baking sheet. Discard the bacon fat (or save for another use) and wipe the skillet clean but do not wash. Heat over medium-high heat until very hot, about 5 minutes.
Add the buns split-side up to the baking sheet with the bacon and bake until the buns are toasted, about 5 minutes.
Loosely form the beef into 4 balls. Add one ball of beef to the skillet and press firmly to flatten with a large flat metal spatula for 10 seconds, then gently remove the spatula. Sprinkle the patty generously with salt; repeat with the remaining beef balls, cooking in batches if necessary. Let cook, undisturbed, until well browned on the bottoms, 2 to 3 minutes. Flip the patties, sprinkle with more salt and top each with a slice of Cheddar. Continue cooking until the cheese is melted around the edges and the bottoms are browned, about 2 more minutes.
Spread the mayonnaise mixture on the bun tops. Serve the patties on the bottom buns topped with the bacon, onion, tomato and lettuce.
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