We went to The Counter the other day, there is a new location in Irvine. If you've never heard of it, I recommend you give it a try. Their thing is "Custom Built Burgers", They are the best non-fast food burgers I've ever had. I think this is largely in part because you can put whatever you want in them. Everyone is bound to have different taste preferences so it fits everyone. If you don't like onions, don't get them! Maybe you like pickles olives and bluecheese with a one pounder all beef patty. Who knows? you have so many combinations to choose from. The burgers in this picture and the ones in flickr are the 1/3lb size. They also have 2/3 and 1 pound. I can't imagine eating 1lb burger. They have a small notice in their menu... the weigh of the burger is *after* cooking so you truly get 1 pound of meat.
You can always make a classic burger if you want, beef, tomato, lettuce and american cheese. Or you can mix it up with other ingredients like red bell peppers, crumbled feta cheese, olives, sprouts, grilled onion, mushrooms, avocado, etc. If you don't like beef then they have other meat choices as well, like chicken.
I will probably make my way over to The Counter again at least a few times in the next year. Its one of those places that you'll want to go back again and again, just to try a different combination each time. Cheers.