Millet whisky in India

The millets worth considering

Three grains come up most in Indian distilling conversations. Finger millet, known as ragi, is grown widely in Karnataka and the south. Pearl millet, or bajra, is a staple of Rajasthan and the north west. Sorghum, or jowar, is often grouped with millets and grown across the Deccan.

Sorghum already has a long history as a distilling grain. It is the main grain in Chinese baijiu. Ragi has a long brewing history too, in traditional fermented drinks of the eastern Himalaya. So the idea of a millet spirit is not new. A millet whisky made to whisky rules is the newer part.

Check the rules first

Before any trial, check whether a spirit from millet can be labelled whisky under the current Indian standards and under the rules of any market you plan to export to. Definitions differ on which cereals are allowed, which enzymes may convert the starch and how long the spirit must mature in wood. Rules in India are set nationally, with labelling and licensing handled by states. They also change. Ask a licensing adviser to confirm before you design a product around the word whisky.

Small grains, hard starch

Millets have small grains and starch that generally gelatinises at higher temperatures than barley. Sorghum starch is commonly quoted at about 68 to 78 °C. Distillers usually cook millets near boiling with a heat stable alpha-amylase, then cool the mash before adding malt or other enzymes to finish conversion.

Milling matters. A fine, even grind exposes more starch to water and enzymes. The grains are small enough that a mill set up for barley may pass some through whole, so check the grind with a sieve before each batch. Our guide to grains in whisky compares the main cereals.

Each grain has a quirk

• Ragi malts reasonably well and ragi malt is a familiar food in south India. Malted ragi can supply some of its own enzymes, though usually not enough to convert a large share of unmalted grain alone. Brown varieties carry tannins that can slow enzymes.
• Bajra is high in fat. Once milled, the flour can turn rancid within days, especially in heat. Mill it just before mashing.
• Jowar varieties differ widely in tannin. Pale grain is easier to work with than dark, high tannin grain.

Millet supply chains are shorter and more local than those for maize or rice. Quality varies from lot to lot. Ask suppliers for moisture, foreign matter and, if possible, starch content. Store grain dry and cool. Damp grain in the monsoon can grow mould and mycotoxins, which is a quality and safety issue for spent grain sold as animal feed as much as for the spirit.

Fermenting a millet mash

Millet mashes can be lower in free amino nitrogen than barley malt worts, depending on the recipe. Plan a yeast nutrient dose and measure gravity twice a day for the first batches. Fermentations that slow early often need more nitrogen.

Indian heat is the other risk. Without cooling, a fermenter can climb past 32 °C in summer, where yeast stress rises and bacteria grow faster. Aim for the mid 20s °C and log the temperature. Our guide to whisky wash fermentation covers the basics.

What millet spirit might taste like

There is little published sensory work on millet whisky, so be wary of anyone who claims to know exactly how it will taste. Distillers who have made millet spirits often describe earthy, nutty or grainy notes. The only way to know your own is to make it, cut carefully and nose the fractions.

Maturation in Indian heat is fast. A delicate spirit can be overwhelmed by a fresh cask within a couple of years. Our guide to the angels' share in Indian heat explains why evaporation runs far above Scottish figures.

Spent grain and the rest of the process

Millet mashes are usually fermented and distilled on the grain, since the small grains do not form a good filter bed. That means a still with an agitator and a steam jacket is safer than a direct fired pot, which can scorch the solids. It also means a lot of wet spent grain afterwards.

Spent millet grain, like barley draff, can be a cattle feed if it is handled quickly and kept clean. In Indian heat it spoils within a day or two. Plan the buyer before the first batch. Our guide to draff and spent grain for cattle feed covers the logistics.

A first step

Run a small pilot of each millet you are considering. Cook 5 kg with alpha-amylase, convert with malt, ferment, record gravity daily and calculate litres of pure alcohol per tonne. Distil in a small pot still and nose the hearts diluted to 20% ABV. Only then decide which grain is worth a full batch.

Common questions

Can whisky be made from millet?

Millets are cereals, so a millet spirit is possible. Whether it can be labelled whisky depends on the current rules in India and in any export market, so check before you design the product.

Which millet is easiest to distil?

It depends on the variety. Pale, low tannin sorghum and ragi are generally easier than dark, high tannin grain. Bajra needs to be milled fresh because its fat turns rancid quickly.

Do millets need enzymes?

Yes. Unmalted millets need an enzyme source such as malted barley or commercial enzymes to convert their starch into sugar.

Is baijiu a millet whisky?

No. Baijiu is a Chinese spirit, often made mainly from sorghum with its own traditional fermentation starter. It is not whisky.