Vin d’orange is a delicious, refreshing, and slightly bitter (but not too bitter!) fortified orange wine that’s easy to make at home. It does require you to move fast, though, as Seville oranges — the primary ingredient for vin d’orange — are just in season a short while from December to the end of February. Hurry up! It’s worth it! Vin d’orange is a slightly sweet, slightly bitter fortified wine traditionally made in Provence using Seville oranges.