Prepare Your Toppings: Begin by gathering your toppings: shred the lettuce, dice the tomato, slice pickles, and finely chop the onion. Set these aside.
Make the Sauce: In a small bowl, mix together the mayonnaise, ketchup, and mustard until well combined. Set aside.
Cook the Beef: Heat a skillet or griddle over high heat. Add a little cooking oil to the pan. Take about a handful of the ground beef and form it into a loose ball (around 4 oz).
Smash the Burger: When the pan is hot, place the beef ball in the skillet and firmly press down with a spatula to flatten it. Season with salt and pepper. Let it cook for about 2-3 minutes until a nice crust forms.
Flip and Add Cheese: Flip the patty, allowing it to cook for another 1-2 minutes. Immediately sprinkle shredded cheddar cheese on top and cover the skillet for a minute to melt the cheese.
Warm the Tortillas: While the burgers cook, warm the corn tortillas on a separate skillet for about 30 seconds on each side until pliable.
Assemble the Tacos: Once the beef patties are ready, place each one on a warmed tortilla. Top with shredded lettuce, diced tomato, onion, and pickles. Drizzle the sauce over the top.
Serve: Fold the tortillas over the fillings to create your tacos. Serve immediately while still warm.
Notes
Serve the tacos on a wooden platter with extra sauce on the side for dipping, and garnish with fresh cilantro or lime wedges for a pop of color.