This recipe for hamburgers is very simple. There is no need to add egg to bind the mix, or herbs and spices.
The only additional ingredient, apart from seasoning, is a small amount of finely chopped onion. This helps the flavour and texture, and keeps the meat moist.
You can form the burgers by hand, but I find a burger press very useful. They can be purchased very cheaply, and consist of two round plastic moulds which you push together by hand to squeeze the meat into shape. They make burgers which have a more even thickness and tend to be less likely to fall apart during cooking.