1. In a small bowl, stir together the mayonnaise, ketchup, mustard, pickle juice, and a pinch of the garlic powder to make the burger sauce.

2. In a mixing bowl, combine the ground beef with the salt, black pepper, and remaining garlic powder.

3. Divide the beef into 8 equal portions and press each portion in a thin layer onto one side of each flour tortilla.

4. Heat a large skillet over medium-high heat and place the tortillas beef-side down into the pan.

5. Cook until the beef is browned and cooked through, about 2 to 3 minutes.

6. Flip each taco and top the beef side with a slice of cheddar cheese.

7. Cook for 1 more minute until the tortilla is lightly toasted and the cheese is melted.

8. Remove from the skillet and top with shredded lettuce, pickle slices, diced onion, and burger sauce.

9. Fold and serve immediately.