Brown the ground beef in a skillet over medium heat.
Drain excess fat from the beef.
Add taco seasoning and water, then simmer for 5 minutes.
Prepare taco shells according to package instructions.
Mix mayonnaise, ketchup, and mustard for the sauce.
Fill each taco shell with a portion of seasoned beef.
Top with shredded lettuce, diced tomatoes, and cheddar cheese.
Add chopped pickles for crunch.
Drizzle the special sauce over the top.
Serve immediately and enjoy!