Preheat large cast iron pan over medium heat.

In a medium-size mixing bowl combine your ground beef, Worcestershire sauce, salt, and pepper together and stir until well combined. Shape the mixture into three hamburger patties.

Place your hamburger patties onto your heated cast iron pan and cook to your desired level of doneness.

Remove the hamburgers from the pan onto a plate and allow them to rest for three minutes.

Place the hamburgers on to the center of each lettuce leaf. Top the burgers with the guacamole, ketchup and mustard. Wrap up the lettuce around the burger and enjoy.