We tend to like big 'n' beefy burgers in our household - they may not appeal to all, or be the dictionary definition of a burger, but here is how we do them:
- - minced beef from our local butchers which is not too lean i.e. it has fat to add flavour but not too much to make cooking them on a BBQ a pain;
- chop an onion & some garlic finely to add some texture & flavour;
- the important bit: fry off the onion & garlic & let it cool. We tried doing it without cooking this first & didn't like the texture or taste without this step;
- mix, by hand, the cooled garlic & onion with the beef & add salt & pepper to taste;
- form into thick burgers (see piccy below) & leave in the fridge for a few hours or more.
You could of course add all sorts of herbs, dry & wet flavourings as a variation on these, but given this is a 'basic' recipe this forms the base for any experimentation. My wife sometimes adds a little chilli powder, paprika or wholegrain mustard for a subtle change. You can also put some cheese in the center of the burger at this stage if you like that horrible stuff

Because we make them pretty thick, cooking them requires more time at a slightly lower heat on the BBQ to ensure they get cooked all the way through but not too crispy on the outside - between 20-30 minutes at around 300F, flipped once or twice in the process & then left to rest for 10 minutes at the end.
Some pictures:

