What makes In-N-Out different from other fast food joints?
It's when you top a burger or fries with all the fixins'.
Lettuce, tomato, pickle, cheese, tons of grilled onions... and EXTRA SPREAD.
next slide will load in 15 secondsSkip AdSkip Ad"Spread" is In-N-Out's secret sauce, but it tastes a lot like Thousand Island dressing.
The secret recipe behind the sauce has "never been published," a rep for In-N-Out told Business Insider.
But whatever it is, it's delicious.
It makes you wonder — who would choose this...