I would definitely support a question asking about which ingredients (or cooking methods, or equipment, or whatever else) are traditional/unique to a particular world cuisine.
Make sure the cuisine is specific, of course; "Asian" is way too broad and even "Chinese" has far too many variants to answer sensibly. But if you're asking about, say, Mongolian cuisine, that's probably narrow enough to get something useful out of.
One caveat: Wikipedia has very extensive articles on cuisines, so for your own benefit, try to phrase your questions so that they're not covering exactly the same ground; I just hate to see people put effort into a question and then get answers which are just copy-and-pasted from Wikipedia.
Also one tip: Don't phrase your question like this one. Avoid vague terminology like "authentic". Ask for something tangible that's not just going to result in a slew of opinions.
As for local meals, that sort of depends on the specific question. If you're looking for restaurant recommendations then no, that's off topic. Local dishes, eh, kind of sounds like a list of recipes or at best some sort of travel guide, so I'm inclined to say no to that as well. Maybe steer clear of that sub-topic unless you've got a very specific question that's clearly cooking-related.