I have been told that, in the New Normal, it is forbidden to share menus on restaurants. I have seen some restaurants around here use boards. In others, the waiter tells you the menu.
Another solution is to offer disposable menus. I guess it is an expensive solution, especially if they are made of sturdy cardboard. But it also a good idea for mail art...
This is another original sending from Bryon (the USA): an airplane menu! No doubt that it is a good souvenir from a trip. And, somehow, he managed to write a whole and fun letter inside:
This is a very original one. The menu of a restaurant in Sacramento (California, the USA), but sent from Mexico as well. It is a big A3, folded twice... The kind of things that the owners never suspect to be sent by mail. Let alone to Morocco!