Food is no more art than paint is. It's what you cook that counts. For most people, "art" is associated with imagination, creativity and stimulation. It's about making something new, which is regarded by others as invigorating. I'm not sure how much of my food fits the bill. But is eating sport?
For some people, positive social and economic circumstances of the production of coffee can also add to the positive experience of drinking it. Sorry that sounds very worthy but you know what I mean.
You are right - it is not surprising that people talk about meals in London. But it's also worth remarking how many talked about meals from the UK and Ireland are eaten in London.
Not only does Tebay Services have a decent (but pricey) farm shop, but the people who work there can also tell you the provenance of all of the produce they use is their excellent (and cheapish) cafes. And I understand that it is doing very well.