We're still patiently waiting for In-and-Out to permanently make its way Down Under instead of teasing us with intermittent pop-up stores. You may not be familiar with the cult love around the chain and their "animal" sauce, but if you've ever had one, it's easy to bring that flavour home to enjoy.
The video tells the tale, but the animal sauce itself is pretty simple: vinegar, dill relish, mayo and ketchup, all mixed well to the consistency and flavour of your choosing (although the full recipe is linked below.) You'll also want those trademark caramelised onions for the topping, which can take a little time to make, but is well worth it. The other secret is to cook your burgers, and then spread some mustard on the uncooked side before you flip them over.
Once you do flip them over, top each patty with cheese, cook for about 30 more seconds, then pop them on a hamburger roll with mayo, pickle, lettuce, tomato, and a little of that sauce underneath, and a good dose of those caramelised onions on top. Even if you're not necessarily wild about the idea of "recreating a fast food burger at home," the recipe itself turns out a pretty tasty burger, so it's worth a try. Hit the link below for the full recipe.
Animal-Style Burger [Chowhound]