Take handfuls of beef mince and loosely form into balls. Add the olive oil to the pan.
Once the oil is hot, put the beef balls in the pan and use a spatula to push down into thin patties. Cook for 3 minutes, flip and top with a cheese slice. Cook for 3 minutes more.
Layer the brioche buns with lettuce, 2 burger patties, tomato and pickles. Serve with a generous squeeze of classic sauce.