Put the beef in a large bowl, add the garlic, onion, chilli, parsley, Worcestershire sauce, egg and a little salt and pepper and mix well.
Heat a ridged griddle pan until smoking hot. Divide the meat mixture into 4 and shape into burgers. Add the burgers to the pan and cook for 3 minutes on each side for rare, 5 minutes on each side for medium or 7 minutes on each side for well done. Remove from the pan, cover in kitchen foil to keep warm and leave to rest while you griddle the baps or buns.
Wash and dry the pan, then reheat, add the baps or bun halves and cook briefly on each side until lightly charred. Fill each bun with some salad leaves, tomato slices and a burger. Serve immediately with the relish of your choice.