In-N-Out is The Best, and one of the reasons it's The Best is The Secret Menu, which is ubiquitous enough at this point that we probably don't need to tell you what you can get. But we can tell you what you should get.
You may not even know you can order a freshly grilled, perfectly circular onion to top your burger. If you're not gonna go full-on Animal Style (why are you not doing this?), you probably should.
6. Whole grilled onion burger
This tastes like childhood. And the fact that it's soft-serve makes it even better than childhood, which was already pretty good to begin with.
5. Root beer float
It's the most well-known secret menu item for a reason: the balance between the mustard-grilled patty, the pickles, and the grilled onions smothered in that cheese make it tasty in all the right ways.
4. Animal Style burger
If you thought a standard Double-Double had the perfect meat-to-everything-else ratio, I've got some news for you: a 3x3 is even better. I said it, and I mean it.
3. 3x3 burger
You may only eat these covered-in-sauce-and-cheese spuds once in your life, but that once in your life will be SO WORTH IT. Promise.