Wikipedia Article About Sloe gin on Wikipedia Sloe gin is a red colored liqueur flavored with sloe berries, the fruit of the blackthorn, a relative of the plum. Sloe gin has an alcohol content from between 15 to 30 percent by volume. The traditional way of making sloe gin is to infuse gin with the berries. Sugar is required to ensure that the sloe juices are extracted from the fruit. Almond flavoring may be added.