The Secret Menu Milkshake You Need To Order At In-N-Out (Try It Once, Thank Us Later) - Chowhound

For fast food fans who have had the good fortune to enjoy a Double-Double from In-N-Out, just the idea of a trip to this burger joint is enough to make your mouth water. The menu is simple, but for foodies who love hacking secret menus, simple is just the beginning. The primarily West Coast burger chain's secret menu is pretty epic, with items like grilled cheese, animal-style fries, and even a saltless meat…