I make my own burgers with lean mince from butchers (better value!) and i put mince in a bowl and tenderise it but mushig it around because it gets soft i dont need anything to bind it, i just add onions(0pp) italian herbs, some garlic and a tiny few chilli flakes. then i make into a burger shape and it never needs binding, I fry in spray oil and serve on half a bun with some cheese and some oven chips.(and some light mayo to dip chippies) and whole meal comes in at 16pp. burger bun and chips are the killer so id say your burger was low low low! 4pp at most hunny