Probably the sweetest, brightest, juiciest piece of fruit you could get in the winter is the honeybell tangelo. Want to try some? You should get them fast if you haven't picked them up already; honeybell harvest is short (pretty much just January). Then they are gone until next year.
Citrus connoisseurs love them because of their incredible amount of juice and sweetness, and the fact that they are nearly free of seeds and all of the white stringy stuff found inside most other oranges.
The honeybell tangelo, which is a cross between a tangerine and a grapefruit, is one of juiciest of all the oranges. It looks like a navel orange, but has a dome (or "crown") at the blossom end, hence the honeybell moniker.
If you've never had one, you might want to eat one over the sink with plenty of napkins!