"The In-N-Out "Double Double" burger — served off-the-menu "Animal Style" — is a West Coast burger legend. To put the craze into perspective, people have gone as far as to freeze-dry the In-N-Out classics and ship them cross-country. Whether it’s due to the secret sauce (that some believe is really just Thousand Island dressing), the caramelized onions, or the fact that the burger patties are never frozen, it’s clear that this is an iconic burger that’s worth making at home. ..."