Crème de Cassis Cocktails: Kir, El Diablo, Vermouth Cassis and Why the Bottle Fades

Crème de cassis is a blackcurrant liqueur, and the word crème on its label has nothing to do with dairy: under European Union rules it marks a fruit liqueur that is unusually sweet, and crème de cassis, which has its own line in the regulation, must carry at least 400 grams of sugar per liter and at least 15 percent alcohol. Most other fruit liqueurs sold as crème de need only 250 grams. That single number, roughly two-fifths of the bottle’s weight in sugar, explains nearly everything about how the liqueur behaves in a glass, from why it sinks under Champagne to why a heavy pour turns a dry wine into something closer to jam.

Of the 107 recipes in the CocktailBuilder database that use it, most fall into four groups: wine and sparkling wine, vermouth, spirit highballs built on ginger or soda, and a smaller set of beer and cider drinks that come out of British pubs rather than French cafés.

What blackcurrant brings

Blackcurrants (Ribes nigrum) are small, very dark and almost too sour to eat raw, which is precisely why they suit a liqueur. The fruit is macerated in neutral spirit, the colored and flavored spirit is drawn off, and sugar is added in quantity; the result keeps the berry’s sharp acidity under all that sweetness, along with a faint green, leafy note that recalls the bush itself. Its deep purple comes from anthocyanins, the same family of pigments found in red wine and blueberries, and those pigments are part of the reason an opened bottle does not last.

Americans are less familiar with the fruit than Europeans for a historical reason. Blackcurrant bushes host white pine blister rust, a disease that threatened the timber industry, so federal law banned growing them for much of the twentieth century; the federal ban was lifted in 1966, although several states kept their own restrictions for decades afterward. Blackcurrant cordial, jam and candy therefore never became the everyday flavors in the US that they are in Britain and France, and cassis still tends to read as exotic on an American menu.

Wine first: the Kir family

The Kir is named for Félix Kir, the priest who served as mayor of Dijon after the Second World War and who poured blackcurrant liqueur with local white wine at civic receptions, which is how a regional habit known as blanc-cassis acquired a person’s name. The original wine was Bourgogne Aligoté, a sharp, high-acid white that needed the sugar; a soft, oaky Chardonnay, by contrast, makes a flabby Kir. The database version adds a little lemon, which compensates when the wine on hand is not acidic enough.

Because the liqueur is so dense, the ratio matters far more than it would with a drier modifier, and the table below shows how quickly the character changes.

The Kir Royale replaces still wine with Champagne, and here the sugar works physically as well as on the palate. Poured first, the liqueur settles at the bottom of the flute, and wine added on top may leave a darker band at the base unless the glass gets a gentle stir; poured last, the dense liqueur falls through the wine and mixes on the way down. With red wine instead of white the drink is usually called a Kir Cardinal, and the Bordij is a fortified relative of it, adding Cognac to red Bordeaux and cassis.

Vermouth, and the drier side of cassis

The Vermouth Cassis is the oldest café drink here and arguably the most useful: dry vermouth, crème de cassis and soda water, in the database at one and a half ounces of vermouth to three-quarters of an ounce of cassis before the soda. Dry vermouth contributes bitterness and a wine acidity of its own, which stops the blackcurrant from cloying, while the soda thins the sugar to the point where the drink can be taken before a meal without spoiling an appetite. The Vermouth Cassis Tall is the same thing lengthened.

Add gin to the vermouth and the drink becomes a Parisian Cocktail, which is stirred and served up. It is a dry gin drink with the blackcurrant supplying what little sweetness it has. Since the vermouth carries much of the structure in all of these drinks, an old, oxidized bottle of it spoils them faster than tired cassis would.

Spirits, ginger and soda

The El Diablo is the drink that keeps cassis behind American bars. It appeared in print in Trader Vic’s recipes in the 1940s, and the database build is reposado tequila, lime, cassis and ginger beer: one and a half ounces of tequila, half an ounce each of lime and cassis, topped with two or three ounces of ginger beer. The heat of the ginger and the vegetal edge of agave both need a sweet, sharp fruit to bridge them, which blackcurrant supplies better than grenadine does, and the cassis is often poured last so that it bleeds downward through the ice. The plain Diablo uses ginger ale, which produces a softer and sweeter highball, while the Rosarita Highball is essentially the same idea under another name. More ginger-forward builds are collected in our post on ginger beer cocktails.

Scotch is less obvious. It works. The Purple Heather is blended Scotch, cassis and soda water, a highball in which the malt’s cereal sweetness and the berry’s tartness meet halfway, and the Bleeding Heart pairs cassis with Campari and soda, so that bitterness rather than spirit is doing the balancing.

A Bramble, strictly speaking, is made with crème de mûre, which is blackberry, and the Bramble in the database follows that rule with gin, lime, sugar and mûre. Cassis can stand in when mûre is unavailable, although the drink becomes noticeably more tart and darker in color, so a little extra sugar syrup brings it back into line.

Beer and cider

British pubs reach blackcurrant through cordial rather than liqueur, in drinks like snakebite and black, but the Snake Bite Bites Back uses crème de cassis with lager, cider and a measure of Pernod, which makes it stronger than its pub ancestor and considerably more aromatic. The Cassis Orange, at the other extreme, is two ingredients and has a post of its own, mostly about the ratio that keeps it from tasting like syrup.

Why the bottle fades

An opened bottle changes in a predictable order, because three slow reactions run at once.

1. Color goes first. Anthocyanins are unstable in the presence of oxygen and warmth, so the bright violet shifts toward brick red and then brown, much as an old red wine browns at the rim.
2. Aroma follows. The fresh, slightly catty top note that marks good blackcurrant is carried by volatile compounds that oxidize and evaporate, leaving a flatter, cooked-jam smell.
3. Sugar stays. Nothing removes the 400 grams, so a faded bottle is still fully sweet, which is why tired cassis makes a cloying Kir rather than a weak one.

At 15 to 20 percent alcohol the liqueur is too weak to protect itself the way a 40 percent spirit does, which is why keeping the opened bottle in the refrigerator, tightly capped, slows all three changes considerably. The usual advice is to finish it within several months, and a small bottle is the practical choice for anyone who makes a Kir only occasionally. The liqueur shelf-life guide compares cassis with the more stable liqueurs on the same shelf.

Last modified on November 8, 2026