Make the optional burger sauce by mixing the sauce ingredients in a small bowl.
Preheat your pan or skillet to medium-high heat.
In a mixing bowl, combine the ground beef and salt. Gently mix them together until well incorporated, being careful not to overwork the meat.
Divide the ground beef mixture into 4 equal portions and shape them into round patties, ensuring they are slightly larger than the size of the burger buns, as they will shrink slightly during cooking.
Add the butter to the preheated skillet. Add the burger patties and cook for approximately 3-4 minutes on one side and flip
Add the cheese if using, place a lid on the pan and cook for a further 1-2 minutes until the cheese has melted.
Remove the burgers from the pan and leave to rest on a wooden board for 5 minutes.
Place the burger buns in face down and toast for 1-2 minutes until the bottoms are light brown and crisp. Remove and set aside.
Assemble the burgers. Spreading the sauce on the bottom of each bun, add a cooked burger patty followed by other toppings including lettuce, pickles and tomato and serve immediately.