Fresh tangerine juice. For about 6 months of the year here in Big City, the grocery store that I shop at, Hortifruti (pronounced "oat-chi-fruit-chi", kind of fun to say) has fresh squeezed tangerine juice. Year round they have a lovely selection of fresh juices like, orange, pineapple, pineapple with mint (sounds kind of gross, but it's really good), watermelon, papaya (ewwww), papaya and orange, orange and carrot, kiwi, etc. etc. But the tangerine juice is my favorite. Of course, it's the most expensive, but I really don't care. You can't get it the States so I have to take advantage of it while I live here.
Sadly, we are back to nasty long-life boxed milk here after enjoying fresh in Mexico City, but at least I have my juice!