Royal Walnut Aperitif is a type of liqueur or wine made from macerated green (unripe) walnuts, often combined with spices, herbs, and sugar, and then aged to develop a rich, complex flavor profile. These liqueurs, such as the traditional Italian Nocino or French Vin de Noix, are enjoyed neat as a digestif after meals, in cocktails, drizzled over desserts, or even used as a flavoring in cooking and cheese pairings.