All hamburgers are extremely simple; they should taste of unadulterated meat so must not be bound with egg or coated with flour. Unlike meatball mixtures which can benefit from all manner of spices and additions, hamburgers should be seasoned only with black pepper and sea salt, and possibly a little finely chopped onion and capers. I add some fresh green peppercorns and a little ground coriander seed, or a spoonful of tomato purée if I am not sure of the beef’s quality. Ideally it should be top quality and fairly lean, and it must be coarsely minced.