In-N-Out Burger — Restaurant in San Marcos

Top 30 In-N-Out Secret Menu Items Extra Toast This is for all my fellow toast enthusiasts! Your hamburger bun will be left on the grill for an extra minute or two, making it that much crispier and a whole lot yummier. Yes, it's free of charge.

Mustard Grilled Guys, this one is no joke. Just say the word and the cook squirts mustard on the top of the patty and flips it, so it literally sizzles and seeps inside the meat while on the grill. I mean…

Cold Cheese It’s exactly what it sounds like. Sub in the regular melted American cheese with a slice of cold cheese if that’s your thing.

Double Meat Order two beef patties but keep the rest of the toppings (tomatoes, lettuce, cheese, etc.) the same for a more meaty experience than your classic Double-Double.

3x3 (aka Triple Triple) This burger comes with three beef patties and three slices of American cheese.

4x4 (aka Quad Quad) This bad boy contains four (!) beef patties and four (!) slices of American cheese.

Grilled Cheese The ultimate vegetarian item on the menu: Ask for two slices of American cheese, lettuce, tomato, spread, and onions on a bun.

Cheesy Wiki JIC a regular grilled cheese isn't enough to happily glue your teeth together: This bb has four slices of cheese.

Protein Style Gluten-sensitive? Just a big fan of romaine? Get your burger wrapped in lettuce instead of a bun.

Tomato Wrap If you're bored of the infamous "Protein Style", you can get any burger you want wrapped in two slices of tomato instead of bread. Messy, but I am totally here for it.

Medium Rare With the exception of Nevada (due to state laws), you can ask to get your burger cooked medium rare, if that's your thing.

Animal Style Burger This extra beef patty is cooked in mustard and comes with extra spread and grilled onions.

Flying Dutchman Ask for two slices of cheese melted between two burger patties—that’s it. No bun, no greens.

Wishburger or Veggie Burger This sandwich is stuffed only with vegetables—no meat or cheese.

Chopped Chilies Add a sprinkle of hot chopped peppers to the bottom bun for some extra spice.

Grilled Onions or a Grilled Whole Onion Swap out standard-issue raw onions for sweet and savory caramelized ones.

Scooby Snack A single grilled beef patty. Y'know, just for a little snack.

Doggy-Style A protein-style grilled cheese with fries inside the lettuce sandwich.

Fries Well Done Want your fries crispier than usual? Simply ask for a batch that spent more time in the fryer. (Soooo worth it.)

Fries Light Order lightly-fried potatoes. (UM, I'M JUDGING YOU.)

Animal Style Fries Arguably one of the most popular secret menu items. Top your fries with cheese, spread, and grilled onions. A classique.

Cheese Fries If the pile of stuff above isn't your scene, just ask for cheese fries. :)

Roadkill Fries If animal-style fries aren't enough for you, order the roadkill fries. AKA, it's a flying dutchman on top of animal fries. Oooooohboy.

Advertisement - Continue Reading Below Root Beer Float Order a half cup of root beer, and ask for a swirl of vanilla shake on top.

Black and White Shake Ask for chocolate and vanilla swirled together.

Neapolitan Shake Order three shake flavors (chocolate, vanilla, strawberry) in one cup.

Around the World Shake Every ice cream flavor combined. I mean, sure. Why not?

Advertisement - Continue Reading Below Lemon Up We love a good two-in-one deal. And that deal is pink lemonade mixed with 7-Up? Umm, yes please and tysm.

Pup Patty An unsalted patty FOR YOUR FLOOFY FRIEND. Brb, sobbing forever.

16x16 According to the same Reddit AMA mentioned above, staff members are not allowed to make anything larger than a 4x4 anymore. But, I have on record from a native Californian and In-N-Out Expert™ (aka my boyfriend) that the elusive 16x16 still exists out there. I'll let the X-Files theme song play you on your way out.

As of 2024 Source...

In n out the burgers, go in the poop comes out.I mean, it's not the best, but everybody says it is. If you are from a place that doesn't have in and out ....don't get your hopes up worst of all the fast food joints.

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Where to begin.. been coming here on/off since back when the Chick-fil-A next door used to be a Krispy Cream donuts (those were the days if you ask me). Now the center is busier than ever, the cops removed the stop sign when coming into the center, probably so they could get food from these places faster. Parking lot is not good and I recommend coming here before 11 AM or on Sunday when Chick-fil-A is closed. Don't bother trying the drive-thru. So why 1 star for this In-In-Out? Simply put it's no longer as good, as fast, as cheap or as fresh as it used to be. So yeah, that's a lot. At this point in 2025 there are so many restaurants we can order pickup online and this is the only restaurant that doesn't have this. The service is very slow even coming here before 11 AM. Why did it take 15 minutes to receive 1 burger before 11 AM when it wasn't very busy? Here is how my last experience went down today: Walked in the handicap side entrance but was not served first despite being first in line. The girl cashier looked at me and then looked away and helped someone else who walked in the "main" entrance. Off to a rough start. Then after I ordered it was a waiting game of 15 minutes to receive 1 burger. That burger had a stale bun that fell apart, was not fresh and didn't have much flavor and was in no way, shape or form worth $6.50. Overall I cannot recommend In-In-Out in 2025 and I prefer a place like Shake Shack where you get a nice soft bun and larger patty at a...