A Quiz about American Culture

So there's a poster around town for a new food product and every time I see it, I have to laugh. I laught because it references american culture in a way that perplexes me. Then again, american culture often perplexes me when I encounter it in the States, too, so maybe this is not so strange after all. In any case, here is a little quiz:

Please read the following and then fill in the blank:

New Orleans: Jambolaya
Boston: Baked Beans
Maine: Lobster
San Francisco: (?)

The poster in question is for a new Haagen-Daaz flavor called something like Cookies and Cream Supreme. The tagline is: San Francisco's delicacy.

Um, wha? First of all, can cookies and cream really be called a delicacy? Is there anything delicate about the combination of oreos and cream? It's really more a gluttony. Second of all, San Francisco???? HUH???