Bought this at Lowe's for $7.99, called charcoal companion or something like that.
Basically pack the bottom with 1/2 pound of meat and then stick the top part into the meat to make a cavity, then you fill the cavity with cheese or (my favorite) Bacon and Cheese. Then you put a 1/4 pound of meat in the lid and seal. Yes a stuffed 3/4 lb. burger