• Preheat the oven to 180ºC (350ºF). Preheat the grill (broiler) to medium–high.
• Divide the beef into four equal portions and shape each one into a patty, flattening them to the same size as your burger buns.
• Heat a drizzle of olive oil in a frying pan over medium heat. Add the patties to the pan, season with salt and pepper, and cook on one side for 2 minutes. Turn the patties over, place the cheese slices on top and cook for a further 2 minutes. Remove from the pan and leave to rest for 2 minutes.
• Meanwhile, warm the burger buns in the oven for 3 minutes, and cook the bacon rashers under the grill.

TO SERVE

• Cut the warm burger buns in half widthways.
• Cut the bacon rashers in half.
• Spread the mayonnaise on the base of each bun. Top with a piece of lettuce, then a burger patty. Add a dollop of onion confit, a bacon slice and dill pickle.
• Drizzle with barbecue sauce and top with the other half of the bun.