Kumquats:

Snacking on some kumquats; what a delicious, adult treat, sweet, sour, and bitter. I wouldn't have thought of even mentioning them -- hasn't everyone tried them? -- but then I remembered how someone roughly my age was talking about having recently tried artichokes for the first time. Not everyone is quite as variety-of-produce-obsessed as we Californians; so if you haven't tried them before, and don't mind some bitter flavor in your dessert, give them a try. And remember: Eat them whole, don't peel them.