What must liqueurs contain by law?

Liqueurs must contain at least 2.5% sugar by weight, which is a legal requirement that defines what qualifies a beverage as a liqueur. This emphasis on sugar content is key because it differentiates liqueurs from other types of spirits; the sweetness is an essential characteristic of liqueurs, contributing to their flavor profile and appeal.

While some liqueurs may have higher sugar contents, the minimum threshold is established at 2.5% to ensure that they have the sweetness necessary to classify them correctly. This distinction also highlights the diverse range of flavors and sweetness levels that liqueurs can have, from herbal to fruity to creamy, while still meeting the legal requirements that classify them as liqueurs in the marketplace.