Sloe gin is a tart liqueur made by macerating sloe berries (blackthorn) in gin, usually with the addition of sugar or sugar syrup. The combination is left to macerate for several months, resulting in a deep ruby or mahogany-colored drink with a bitter-sweet flavor and herbal aroma.
Sloe gin is still made at home, but commercial varieties are also available. This liqueur is best made with ripe berries, and homemade versions are easily sweetened to taste. Sloe gin most likely originated in England, where it has a centuries-old tradition.