Separate beef into 4 equal portions. Use hands to lightly form into patties the size of your buns (mine are about 10 cm / 4") - don't press hard, light fingers = soft juicy patties (see video for how I do this).

Season generously with salt and pepper on both sides. Make a dent on one side (stop burger from become dome shape and shrinking when cooking).

Heat 1 tbsp oil in a heavy based skillet or BBQ over high heat. Add onion and cook until wilted and caramelised. Season with salt and pepper, then remove.

Heat 1 tbsp oil until smoking. Add patties and cook for 2 minutes until deep golden with a great crust. Do not press! Flip carefully, cook for 1 minute then top with cheese (if using). Cover with lid and cook for further 1 minute until cheese is melted.

Meanwhile, toast the cut side of the buns lightly.

To serve: Spread base of buns with sauce / condiment of choice. Top with lettuce then tomato, then hamburger patty. Pile over onions, sliced pickles, then more sauce/condiments. Top with lid of bun. Serve immediately.