burgulation.

Being a California gal & all, I definitely love me some In-N-Out. Happily, I came across an article that by far has the best take on the secret menu of thou adoring burger spot. Next visit, I'm definitely ordering a Grilled cheese. You read it right, Grilled cheese! (For the record, I'm an ultimate grilled cheese junkie). Oh, and well done animal style fries, and a Neapolitan Shake. NOM NOM NOM NOM NOM NOM NOM, NOM NOM. 

http://aht.seriouseats.com/archives/2011/03/the-in-n-out-survival-guide-we-ate-every-single-item-on-the-secret-menu.html