Vodka and the neutral spirit

Every other spirit on the shelf is defined by what it keeps: juniper, cane, agave, the wood. Vodka is defined by what it leaves behind. It is the clearest view of distillation itself, and for that reason the most misunderstood bottle in the bar.

What vodka is

In the United States, neutral spirits are distilled from any suitable material at or above 95 percent alcohol and bottled at 40 percent or higher. Vodka is neutral spirits that may be adjusted with up to two grams of sugar and one gram of citric acid per liter, may not be aged or stored in wood (except, oddly, in paraffin-lined barrels for bottled-in-bond vodka), and may call itself charcoal filtered if treated with at least an ounce of activated carbon per hundred gallons. Add any other flavoring and it becomes flavored vodka.

For decades the American definition carried the famous phrase: vodka had to be without distinctive character, aroma, taste or color. In 2020 the TTB struck that language, saying it no longer matched what consumers expected, and the current regulation defines vodka by its production limits instead. The European Union never went that far. Its category describes vodka as agricultural alcohol, fermented from potatoes or cereals or other farm materials, distilled so that the character of the raw material is selectively reduced, at 37.5 percent or above, with sweetening capped at eight grams per liter and no coloring. Vodka made from anything other than potatoes or cereals must say so on the label, which is why grape and whey vodkas announce their origin.

How it is made

The base is anything with starch or sugar. Wheat is the most common and gives a soft, faintly peppery, lemon-zest spirit. Rye is nuttier and a little sweet, the Polish tradition. Barley is bready, the Finnish habit. Corn is buttery; potato is creamy and faintly vegetal; grape gives a citrus brightness; sugar beet and molasses are used in volume production. The base is fermented into a weak wash and distilled in a continuous column, where the spirit is lifted to about 96 percent, close to the azeotropic ceiling at which ethanol and water will not separate further. This is rectification: the removal of the congeners, the heads and tails, the fusel oils and aldehydes, that in whisky or rum would be called flavor.

Here the honest part begins. Most vodka brands do not run that first column. They buy neutral spirit from large agricultural distilleries and then either rectify it again in their own stills, filter it, or simply dilute it to bottling strength with carefully treated water and a trace of sugar or acid. Difford's calls the last group compounders, and there are many of them. Filtration, most often through charcoal, polishes texture; water source and mineral content shape mouthfeel. Claims about the number of distillations describe column passes that happened at the industrial supplier and tell you almost nothing.

What survives all of that is subtle but real: a wheat vodka and a rye vodka taste different side by side, and a good potato vodka has weight that a column could never add. The 2020 change in American law was an acknowledgment of what bartenders already knew.

Styles and regions

The useful map follows the base. Poland favors rye, Finland barley, Russia and most other countries wheat, and the best-known grape vodka is French. Polish and Nordic traditions include flavored styles, among them bison grass, dill and cloudberry, that long predate the modern flavored-vodka boom.

In cocktails

Vodka's job is to add strength without changing the subject. The Vodka Martini is a drink about dry vermouth, temperature and garnish, and a wheat vodka serves it best. The Moscow Mule needs a clean spirit that lets ginger beer and lime lead. The Espresso Martini is coffee, sugar and foam held together by vodka's neutrality; a rye vodka adds a nutty edge that suits it. The Bloody Mary is the case where a characterful potato vodka justifies itself, because the drink is savory and heavy enough to notice texture. In the tiki and tropical canon vodka rarely appears, and in stirred bitter drinks it is generally the wrong tool: a Negroni needs juniper.

Buying by style

Ignore the bottle. Buy by base and by producer. For Martinis and highballs, a wheat vodka from a distillery that ferments its own grain. For savory drinks and sipping cold with food, a rye or potato vodka. Treat price above a modest level as packaging: the costliest part of vodka is the glass and the marketing, and blind tastings rarely reward the premium. Flavored vodkas should list real botanicals or fruit rather than natural flavors; the EU rule requiring raw material statements is a useful guide even outside Europe.

Folklore and fact

The no-taste myth had the law on its side until 2020 and is now simply out of date. The second myth, that distillation count equals quality, confuses a continuous column's many plates with repeated batch runs; spirit at 96 percent cannot be made purer by distilling it again, only polished. The third is that vodka is Russian: the word is Slavic, and the Polish and Russian claims are both old and neither is settled.

Sources

• 27 CFR 5.142, Neutral spirits or alcohol, and 27 CFR 5.88, Bottled in bond (Cornell LII).
• Regulation (EU) 2019/787, Annex I, category 15 (EUR-Lex).
• Difford's Guide, "Definition of vodka", "Vodka production: raw ingredients" and "Vodka production: rectification".