Amaretto

Amaretto is the name for the various almond flavoured liqueurs, but the most popular brand is Disaronno from Italy. It makes a nice aperitif.

From Wikipedia:

Amaretto (Italian for "a little bitter") is a sweet Italian liqueur that originated in Saronno, Italy. While originally flavoured from bitter almonds, various modern commercial brands are prepared from a base of apricot stones, peach stones, or almonds, all of which are natural sources of the benzaldehyde that provides the principal almond-like flavour of the liqueur.

When served as a beverage, amaretto can be drunk by itself, used as an ingredient to create several popular mixed drinks, or added to coffee. Amaretto is also commonly used in culinary applications.

Also from Wikipedia:

Disaronno Originale (28% abv) is an amaretto-tasting liqueur with a characteristic almond taste made in Italy. Its maker, Disaronno, maintains its original "secret formula" is unchanged since 1525....