Absinthe cocktails.

Absinthe is a high-strength spirit flavoured with grand wormwood, green anise and fennel, and for a century it was the most notorious bottle in Europe. The hallucinations were a myth, the ban was politics, and the drink itself is an anise-forward, herbal spirit that in small amounts — a rinse, a dash — makes a surprising number of classic cocktails work.

What is absinthe?

A spirit of 45 to 74% ABV distilled or macerated with Artemisia absinthium (grand wormwood), green anise and fennel — the "holy trinity" — plus a supporting cast of herbs such as hyssop, melissa and petite wormwood. It was born in the Val-de-Travers in Switzerland in the late 1700s, industrialised at Pontarlier just across the French border, and by the 1890s was the drink of Paris.

It is not a liqueur: traditional absinthe has no added sugar. It is bottled strong because the botanical oils only stay dissolved at high proof. Add water and they come out of solution as a cloud — the louche — which is how the drink was meant to be served.

Wormwood contains thujone, and the belief that thujone caused madness drove bans in Switzerland (1910), the United States (1912) and France (1915). Modern analysis of pre-ban bottles found thujone levels far too low to do anything; what harmed absinthe drinkers was the alcohol, and the cheap versions coloured with copper salts. The US lifted its ban in 2007, and the EU and US now cap thujone at 10 milligrams per litre, which most absinthes have always been under.

How it's made

Proper absinthe is distilled. The three main herbs are macerated in neutral spirit — traditionally a grape spirit — and redistilled, which gives a clear blanche. For a verte, a second set of herbs (petite wormwood, hyssop, melissa) is steeped in the clear distillate, which draws out chlorophyll and the natural green. Light turns that green to amber over time, the feuille morte colour of old bottles.

The shortcut is oil mix: neutral spirit, essential oils, food colouring. Many of the lurid green bottles sold to tourists are made this way and taste of mouthwash. "Distilled" on the label is the thing to look for.

What it tastes like

Anise first — liquorice, fennel — then the bitter, dry, faintly medicinal edge of wormwood, and behind it a garden of herbs: mint, lemon balm, hyssop. A good verte is fresh and grassy; a blanche is cleaner and more floral. Neat at 68% it is overwhelming; diluted three to one with iced water it is bright, bitter-sweet and cooling, and the louche turns it a milky pale green or white.

Styles worth knowing

Style	What changes	In a drink
Verte (green)	Distilled, then herb-coloured; 55–72%	Sazerac rinse, Corpse Reviver No. 2, the classic louche
Blanche / la Bleue (clear)	Distilled, uncoloured; Swiss tradition	Cleaner in cocktails; a Chrysanthemum
Absinthe supérieure	Marketing term; usually means distilled	As verte
Oil-mix / "Bohemian"	Essential oils, dye, often no distillation	Avoid
Pastis	A sweetened, lower-proof anise drink made to replace absinthe	See pastis; a workable rinse

Which bottle to buy

Buy one distilled verte from France, Switzerland or a reputable American producer, at 55% or above. A single bottle will last for years, because almost every cocktail uses a rinse or a few dashes. Price tracks quality more closely than in most categories; the cheapest bottles are oil mixes.

The fire-and-sugar ritual with a flaming spoon is a 1990s invention with no history; it burns off exactly the aromatics you paid for. Water, slowly, over a sugar cube if you like, is the serve.

Using it in drinks

Absinthe is a seasoning. The Sazerac is built in a glass rinsed with it and the excess thrown away. The Corpse Reviver No. 2 takes a dash in the shaker, as does the Monkey Gland, the Tuxedo and the Remember the Maine; the De La Louisiane uses three. Those few drops bring lift and a cool herbal finish that nothing else supplies.

Where it leads: Death in the Afternoon (absinthe topped with Champagne), the Absinthe Frappé (over crushed ice with soda and mint), and the traditional drip. Use an atomiser or a dasher bottle to control it — a free pour will drown a drink.

Substitutes

Pastis is the closest for a rinse or a dash, a little sweeter and lower in proof. Herbsaint, the New Orleans anise liqueur made for exactly this purpose, is the traditional Sazerac stand-in. Anisette, ouzo or sambuca will do in a rinse, with more sugar. A dash of green Chartreuse gives the herbal lift without the anise, which in some drinks is an improvement.

Storage

Upright, cool, and out of the light — a verte on a sunny shelf turns brown in weeks. At 55% and above it is otherwise indefinitely stable; an open bottle will outlast your interest in it. Do not refrigerate, and never store it in the freezer, where the oils can precipitate.

Questions

Is absinthe hallucinogenic? No. Thujone at the levels found in absinthe has no such effect, and modern bottles are capped well below any dose that matters. The stories came from alcoholism, cheap adulterants and the temperance movement.

Is absinthe legal? Yes, in the US since 2007 and across the EU. Some countries require the word "absinthe" to be less prominent on the label, which is why some bottles say "absinth" or carry an odd name.

Why does it turn cloudy? The anise and fennel oils dissolve in high-proof alcohol but not in water. Dilute it and they come out of solution. That is the louche, and it is the sign of a real, distilled absinthe.

Do I need to light it on fire? No. That ritual was invented in Prague in the 1990s to sell oil-mix absinthe. Drip iced water over a sugar cube instead, or skip the sugar.