Is it that time of year again already? The time when we scour Chicago for the latest, greatest thing between a sliced bun? Yes, we are talking about burgers, but this time, we did not touch a single menu while compiling this collection of meaty offerings. Indeed, some of the best burgers are found off the menu, secret burgers that appear only upon special request or on select occasions. Here are 10 tasty burgers you won't want to miss - no menu required.