Alegar is a sour, fermented liquid made from apples and other fruits. It is a traditional drink in many parts of Europe, particularly in the British Isles, where it has been consumed for centuries. Alegar is made by fermenting apples and other fruits with yeast and sugar, resulting in a tart, slightly alcoholic beverage. It is often served chilled or over ice, and can be used as an ingredient in cocktails or other drinks.