Apparently Cheeburger Cheeburger has a 1lb burger. Looks pretty tasty to me, although I think a 2lb burger would be more of a challenge... ;)
From: http://flickr.com/photos/sublimedissonance/110368627/
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SupersizedMeals.com
http://www.supersizedmeals.com/food/article.php/20061018-Cheeburger_Cheeburger_1lbBurger