Rucolino is a traditional liqueur made from arugula (known as "rucola" in Italian), which gives it its distinctive name. This liqueur is typical of the Campania region in Southern Italy, especially the island of Ischia.
The typical process of making rucolino starts with macerating fresh arugula leaves, citrus peel, and some botanicals in alcohol, then sweetening the mixture with sugar or syrup and allowing it to age. The resulting liqueur has a unique bittersweet taste, derived from the peppery flavor of arugula.