Things aren't always what they seem. Often, your favorite restaurant is hiding something from you. No, we're not talking about a bottle the chef might be nipping into when service ends or any unwelcome guests hanging around the kitchen. We're discussing dishes reserved only for in-the-know diners, servings kept in low-profile until word-of-mouth or a whisper from the waiter earns them a place on your plate. Sometimes these take the form of a secret specialty, a super debaucherous dessert, a conscious tweak, or even an entire low-key menu of variations or experimental potions. Here now, a look at 21 such off-menu dishes and drinks served around L.A. restaurants, or at least the ones our restaurants were willing to give up. You're not going to see them printed on the menu, but if you ask nicely, you just might find them hitting the table next time you're out on the town.