Eataly
At this lively shop---the original location in the now international Italian cuisine empire---with an attached bookstore, you can grab a bite to eat or have a glass of wine while stocking up on high-quality olive oil, vinegar, cured meats, and artisanal pasta. On the top floor, you can have a full-fledged trattoria meal, but what you can't have is anything decaffeinated. It's considered "chemical."