Brewing with jaggery

What jaggery is

Jaggery, or gur, is unrefined sugar made by boiling down sugarcane juice. Palm jaggery (karupatti in Tamil Nadu, or the date-palm nolen gur of Bengal) is made from palm sap. Both are mostly sucrose, with some glucose and fructose, moisture and the minerals and flavour compounds that refining would strip out.

Brewing yeast ferments those sugars almost completely. That is the point of using it. Our guide to brewing sugars explains how simple sugars behave differently from malt.

What it does to a beer

Because it ferments so fully, jaggery raises the alcohol without adding much body. It leaves a drier finish than the same strength from malt. In a strong beer, that dryness is welcome; Belgian brewers use candi sugar the same way.

The flavour that stays is toffee, molasses and a faint earthy, mineral note. Dark cane jaggery is stronger in flavour than pale. Palm jaggery has a smokier, more caramel character.

It suits brown ales, porters, Belgian-style dubbels and strong dark ales. A golden ale works too if you use a light jaggery sparingly.

How much to use

Keep jaggery to about 5 to 15% of the fermentable sugar. Beyond that the beer can turn thin and cidery, with a hot alcohol edge, because the yeast has too little malt to work with.

As a rough guide, 1 kg of table sugar in 20 litres raises the gravity by about 19 points (from 1.050 to 1.069, say). Jaggery contains moisture and non-sugar solids, so it gives a bit less. Plan on roughly 15 to 17 points per kg in 20 litres. Measure your actual gravity before and after adding it. Adjust next time.

For a 20 litre brown ale at 1.055, half a kilo of jaggery is a sensible first try. Reduce the base malt slightly so the target gravity stays the same, rather than simply adding jaggery on top of a full recipe.

Remember that the alcohol rises with the gravity. Use ABV = (OG - FG) x 131.25 to check your numbers. A drier finish from jaggery means a lower final gravity, which gives a slightly stronger beer than an all-malt one at the same OG.

When to add it

Add it in the last 10 to 15 minutes of the boil. Turn off the heat first, then add the jaggery broken into small pieces and stir until it has dissolved, before you turn the heat back on.

That last step matters. A solid block dropped into a hot kettle sinks, sits on the bottom and scorches. You get a burnt, acrid note through the whole batch. The boil also sanitises it, which is important because jaggery is made in open pans and is not sterile.

Some brewers prefer to add it once the main fermentation slows. The yeast is not overwhelmed early on and it finishes drier. If you do, dissolve it in a little boiled water first, cool it and add it gently.

Choosing your jaggery

Look for plain, darker jaggery with a short ingredient list. Very pale, bright yellow jaggery has sometimes been chemically lightened during manufacture. Darker, traditionally made gur is a safer choice and has more flavour. Organic jaggery from a trusted shop is a good start.

Store it in an airtight jar. Jaggery absorbs moisture from humid air, turns sticky and can grow mould, especially in the monsoon.

Jaggery is also variable from batch to batch, since it is a farm product. Two blocks from the same shop can taste noticeably different. Taste a bit before you brew. Record where it came from.

Pairing it with Indian ingredients

Jaggery is a natural partner for spices. A dark ale with a little jaggery, dried ginger and a small amount of black pepper has a festive, winter character. Our guide to brewing with Indian spices covers doses and timing.

Water matters too. Jaggery carries some minerals of its own, so if your water is already hard, keep the dose modest. Our brewing water basics guide helps here.

Designing a recipe around a sugar like this, so that body, strength and bitterness stay in balance, is a skill. It is easier with someone checking your numbers the first few times.