No need for any of this breadcrumb bollox – just do this:
1kg minced beef
3 tbs ketchup
3 tbs oyster sauce (negates the need for salt and improves binding)
1 egg yolk
diced onions
herbs of choice (fresh definitely best) – pick a good handful from one or more of; marjoram, parsley, rosemary, sage, lemon thyme or whatever you fancy
Add seasoning (pepper only)
Roll into patties and slap in the oven/pan/BBQ …
EDIT: most burger buns/baps these days are so puffed up that they take away all the flavour of the burger. So look for good quality ones otherwise try wraps, pittas, Dr Food stuff or just have ’em naked.