i always do the jamie oliver burgers these days. not sure if ive strayed from it a little but i basically use 500g mince (to make 5 burgers), 10 jacobs cream crackers bashed up in a blender, 1 egg, 2 heaped teaspoons of either dijon or wholegrain mustard, and if i remember a splash of worcester sauce. few bits of green herbs in there too, probably parsley, sea salt and ground black pepper..
mix it all together in a big bowl, make into patties and rub a bit of virgin olive oil onto both sides. cover, put in fridge and leave there til you want em cooked.