Hamburger + pepper and onion salt + paprika , then soak in Meat Marinade for 20-ish mins before grilling. I use propane, And then add crumbled cheddar & bacon on the burger about 2 mins before you take off the grill. :D Quite tasty.

Meat + hot metal surface = burger. Good enough for me lol.

I have a small propane grill that I use most of the time.

For the burger, always lean ground beef (not extra lean, which can get dry) and I also add an egg, a tiny bit of milk, and some wheat germ to the full batch before forming the patties, for an ever so slightly different texture and, I suppose, added nutrition.

edit - oh, and salt and pepper and some finely minced onions, and - depending on the rest of the meal - garlic powder or minced garlic.

I usually use coal when I grill. I prepare the meat with Worcestershire sauce, salt and pepper. 

I prefer coal,I like the flavor it adds to my burgers.The only thing I need to put on mine is just cheese please ;).

I would say make sure you get a nice cheese on top, if the cheese is good enough, it will provide all the flavour you need.