In-N-Out has a cult following, which is not so easy for a chain with close to 200 locations. Part of the mystique has to do with what used to be an secret menu, which is now available to everyone on the Internet. Feast on creations like the 2 x 4 (two patties and four pieces of cheese), the 3 x 3 or the monstrous 4 x 4. They even serve a burger for the gluten-intolerant, in which the bun is replaced with a lettuce wrap. The rest of the fare - fries, sodas, shakes - is more conventional.