These days a restaurant’s honest-to-goodness regulars can be hard to distinguish from its Twitter followers, but it’s safe to say that if you’ve heard of the staff-only  Oaxaca sandwich at Tender Greens, you’re on the inside track. Restaurants don’t mention certain dishes on their menus for all sorts of reasons: as a special treat for loyal diners, mystique, ego. We’ve got to admit we like the look our friends give us when we ask for the  homemade blood cake on brioche at Waterloo & City. Never had the  lobster mashed potatoes or wedge salad at BLT Steak? Well, now you can. If it’s before 10 a.m. on a weekend, you can make like James Bond and order the top-secret  Italian Breakfast at Dominick’s, which features two eggs, wild boar bacon, polenta, mushrooms, and grilled bread. You might get the stink eye asking for a hamburger at any other Thai restaurant. At Jitlada, it gets you the superspicy  Jazz Burger wrapped in lettuce. Shhh.
 The Mexican torta comes with chipotle chicken, avocado, queso fresco, and Cholula hot sauce. Olé!
 For the British classic, chef Brendan Collins tops the mix of pig’s blood, caramelized apples, and onions with a fried egg.
 Ol’ faithful: A hunk of iceberg with Roquefort, bacon, croutons, and halved cherry tomatoes.
 Chef Brandon Boudet grills the gamier wild boar bacon over a wood fire for this dish.
 Jitlada’s owner, Jazz Singsanong, only whips up this beef patty with advance notice.