
Crème de cassis is a sweet, dark red liqueur made from blackcurrants (Ribes nigrum).
Intense blackcurrant aroma over a deeply sweet, jammy body, with the tartness of the berry kept in check by heavy sugar.
A small pour sweetens and colours a drink while carrying its blackcurrant flavour; the high sugar makes it markedly viscous, so little is needed, and higher-sugar 'double' versions are dosed in still smaller proportion. It integrates by building or stirring.
Where it merely sweetens or tints, its sugar and syrupy body can be rebuilt with a sugar syrup and its colour matched with another dark-red fruit liqueur; but the blackcurrant aroma cannot be manufactured from an unrelated fruit, so wherever the drink is built around that character only another blackcurrant preparation will serve.
Blackcurrants are crushed and macerated in alcohol, with sugar added afterward; the liqueur is infused rather than distilled, and the fruit is its sole defining flavour source.
The modern liqueur first appeared in 1841 in the Burgundy region of France (Dijon), displacing the earlier 'ratafia de cassis'; a protected geographical indication, 'Crème de Cassis de Bourgogne', was approved in 2015, guaranteeing Burgundian origin and use chiefly of the Noir de Bourgogne blackcurrant variety.

Tequila Sunrise
Tequila reposado

Kir Royale
Dry sparkling wine, Crème de Cassis

Russian Spring Punch
Dry sparkling wine

Stars and Stripes Shot
Crème de Cassis, Maraschino liqueur, Herbal liqueur (e.g., Green Chartreuse)

Alaska No. 2
London dry gin

El Diablo
Tequila reposado, Ginger beer

Original Tequila Sunrise
Tequila blanco

Arnaud
London dry gin, Dry vermouth, Crème de Cassis

Black Forest Gateau
Vanilla vodka

Honey Cobbler
Blended Scotch whisky

Liquorice Shot
Vodka, Sambuca

Parisian Cocktail
Dry vermouth, London dry gin

Kir – IBA
White wine

Russian Spring Punch – IBA
Dry sparkling wine, Vodka