
Amaretto is a sweet Italian liqueur with a distinctive bitter-almond flavor. It originated in Saronno, where Disaronno and Lazzaroni are still made, but the style is now produced across Italy and beyond.
Any other amaretto swaps in one for one. Without one, crème de noyaux has a similar marzipan flavor and goes in one for one, though it is often red and tints the drink. Equal parts orgeat and brandy also stand in, in the same total amount; taste and adjust, and expect a nuttier, more floral drink. Almond syrup alone gives the flavor and sugar but no strength, so the drink comes out weaker and sweeter.
A bitter herbal liqueur. Both names come from the Italian amaro, "bitter", but it will not stand in for amaretto.
Crème de noyaux
Made from apricot, peach or cherry kernels.
Orgeat with brandy
Orgeat itself has no alcohol, so all the strength comes from the brandy.
Sugar and alcohol both preserve it, so an opened bottle keeps for years. What fades is the almond aroma on top; the sweetness and the body stay where they were.
Italian Mezcal Margarita
Tequila reposado