
Chile liqueur is a sweetened flavoured spirit whose defining character comes from chile peppers, giving it a distinct capsaicin heat.
Capsaicin heat is the leading note, wrapped in medium sweetness and the vegetal, sometimes smoky aroma of the pepper variety used; intensity swings from mildly warming to assertively spicy across products.
Reached for when a drink calls for heat and pepper flavour as a headline accent, it is added in small measures and dosed cautiously — heat is not standardised across the class, so the same measure can shift balance very differently between products. Shaken or stirred into the build, it contributes both sweetness and spice.
A chile infusion of comparable heat combined with a syrup or sweetener can approximate it as a minor accent, but where the chile heat and pepper flavour are the drink's point no non-chile ingredient will do, and even another chile product may use a different variety with a different heat and flavour profile.
Chile peppers — fresh, fire-roasted, or dried — are macerated or infused in a base spirit, which is then sweetened. The chile flavour derives from the fruits of Capsicum peppers, with different products drawing on different varieties such as poblano/ancho, roasted poblano, or Espelette; the base spirit is not fixed to the category and ranges from neutral cane spirit to rhum agricole.