Sahti: the Finnish farmhouse beer brewed with juniper

A beer from the farm, not the brewery

Sahti is a traditional beer from rural Finland, especially the southern and western regions. For generations it was brewed at home for weddings, harvests and midsummer. It is strong, usually somewhere around 7 to 11% ABV, cloudy, sweetish and lightly carbonated, with flavours of banana, bread and pine.

Commercial sahti still exists in Finland and the name has protected status in the European Union as a traditional speciality. Most of it is still brewed by small producers or at home.

Juniper instead of hops

The defining ingredient is juniper. Brewers lay juniper branches across the bottom of a long wooden trough called a kuurna. The mash is poured in and the wort runs through the branches, which act as a filter bed in the way grain husks do in a modern lauter tun.

The juniper gives a resinous, piney, slightly woody aroma. It is not the berry flavour you know from gin, because brewers mostly use the twigs and needles rather than ripe berries. Hops are optional and used lightly if at all. Bitterness is low.

The rules sahti breaks

Three habits make sahti unusual to a modern brewer.

• No boil, or a very short one. Traditional wort is often heated only to mash temperatures. That keeps proteins in the beer, which helps the full body and the haze.
• Baker's yeast. Many farmhouse brewers used ordinary baking yeast. At warm temperatures it throws off big banana and clove-like notes.
• Drunk young. Sahti is ready in a couple of weeks and is meant to be drunk fresh, like a living food.

Skipping the boil means wort is not sterilised, so the beer relies on high sugar, quick fermentation and quick drinking. That is how farmhouse brewing always worked. It also means sahti does not keep. A homebrewer copying it needs to be clean and quick.

What sahti tastes like

Pour a glass and expect a hazy amber to brown beer with little foam. The nose is banana and bread with a pine edge from the juniper. On the palate it is sweet, full and smooth, with warmth from the alcohol and almost no bitterness. Some versions have a light rye spice, since rye often goes into the grist alongside barley.

Serve it cool rather than ice cold, around 10 to 12 °C, in a small glass. Traditionally it was shared from a wooden tankard. At this strength a small pour goes a long way. Sahti is best sipped slowly with food such as rye bread, smoked fish or a hearty stew.

If you have tasted a hefeweizen, the banana will feel familiar. If you have tasted a strong saison, you will recognise the farmhouse character, though sahti is sweeter and far less dry.

Brewing a sahti-style beer at home in India

Indian homebrewers have an advantage here, because sahti likes warm fermentation. A rough plan for 20 litres:

• Grist of about 80% pale or Pilsner malt, 15% rye malt and 5% Munich or a little dark malt for colour, aiming for an original gravity around 1.080.
• Fresh juniper twigs, washed, laid in the bottom of the mash tun or a lauter bag as a filter bed. Juniper is not common in Indian markets, so many homebrewers use a few crushed dried juniper berries in the mash instead and accept a slightly different aroma.
• Heat the wort to around 80 °C for 15 to 20 minutes rather than a full boil, for safety and to set the flavours.
• Ferment with a fresh baker's yeast or a farmhouse strain. Norwegian kveik works well and is happy at 30 °C, a temperature many Indian homes reach without trying.

Drink it within a few weeks and keep it cold once it is done. Treat the first batch as an experiment rather than a replica.

What sahti teaches about style

Sahti is a good reminder that styles came from places, ingredients and habits before they came from guidelines. Juniper grew on Finnish farms, so it went into the beer. Bakers' yeast was in every kitchen, so that fermented it.

The same thinking applies in India. Brewers here work with local spices, rice, jaggery and a hot climate. Some of the most interesting beers come from treating those as features. Our guide to brewing with Indian spices picks up that idea.