1Finely chop the onion and garlic.
In a bowl, mix the beef mince with the chopped onion, garlic, black pepper, and grated cheese.
Form the mixture into 4 equal-sized patties.
Heat a pan over medium heat and add the butter.
Once the butter is melted, cook the patties for about 4-5 minutes on each side, or until fully cooked.
While the patties are cooking, toast the burger buns in a separate pan or toaster.
Assemble the burgers by placing a lettuce leaf on the bottom half of each bun, followed by a cooked patty.
Top with the other half of the bun and serve immediately.