Recreate Forgotten Favorites
It's unfortunate when your favorite dish or "usual" at one of your favorite eateries gets taken off the menu. You could inquire about the removal or even petition for its return, but if there is no hope of getting it back, you can attempt the do-it-yourself method. This may not always be possible depending on the dish in question, but there is something to be said for trying.
For example, Burger King used to have something they called "Shake 'Em Up" Fries, meaning that they offered a package of cheese sauce (like the kind used in Kraft Macaroni and Cheese) with their french fries to make them cheesy and even tastier. It was a popular gimmick that sold out and then was discontinued not long after. They now have apple fries, which are served with a caramel dipping sauce and are arguably healthier, but if you want those cheese fries back, if only just once or twice, here's what you can do. Take the cheese packet out of a Kraft Mac and Cheese box you may have at home and store the macaroni in a container for later use (this blogger suggests tuna mac and peas or dried tomato and spice). After you have brought some BK french fries home, take a sandwich bag and shake 'em up with the cheese sauce. If you don't have Kraft Mac and Cheese in the house or don't want to buy it because it's not something you normally eat, another choice is to do it diner-style and melt some cheese on top of the fries inside an oven. It isn't the same thing, but it's still cheese.
Specialty dishes may be next to impossible to replicate if you don't know all the ingredients, especially ingredients crucial to the flavoring that you love. You will have more success with simpler (or simplified) dishes if you can obtain most of the crucial ingredients and put your own spin on them. Sandwiches seem to be the easiest to put together, but, as with any recipe, the results will vary. Whatever the case, I hope it turns out well for you.