Mark Wilson, contributing writer at Fast Co. Design, detailed the ins and outs of “secret” menus at restaurants including Chipotle, Starbucks and In-N-Out Burger. Chipotle’s “Quesarito,” Starbucks’ 170,000 customizable beverage permutations and In-N-Out’s “animal-style” fries are a few of the secret (or not-so-secret) menu options that add to these restaurants’ mystique and allure.

“I think of it as the customer’s the brand manager,” Chris Arnold, Chipotle’s Communication Director says. “The experience of the public is something different for everyone, like an iPod in a way. How many billions and billions of iPods are in circulation, and yet no two [playlists] are alike. You buy a burrito, I buy a burrito. We pay the same thing for it, and they’re two very different things.”

Read about Wilson’s comically relentless quest to order the arcane “Quesarito” at Chipotle, amongst his other classified culinary discoveries.