Pineapple in beer

Pineapple flavour comes from esters and acid

Ripe pineapple gets much of its aroma from esters, the same family of compounds that gives fruity notes to beer, along with a sharp acidity from citric and malic acid. The juice usually sits around pH 3.3 to 3.7 and carries roughly 12 to 15% sugar when ripe.

That acidity is part of why pineapple works so well in tart beers. In a sour or a gose it lifts the fruit. In a sweeter beer it adds a refreshing edge. Our guide to adding fruit to beer covers the general methods.

Bromelain attacks the foam

Fresh pineapple contains bromelain, a protein-digesting enzyme. It is the reason fresh pineapple makes your mouth tingle and the reason it is used to tenderise meat. In beer it attacks the proteins that build and hold a head of foam. A beer dosed with plenty of raw pineapple can pour with a head that collapses within seconds.

Brewers have long known this effect from a related enzyme: papain from papaya was used as a chillproofing agent to stop haze. Heavy doses were known to hurt foam. Our guide to beer foam science explains which proteins matter.

Heat switches the enzyme off

Bromelain is destroyed by heat. That gives a homebrewer three easy options:

• Canned pineapple or pasteurised juice. These have already been heated, so the enzyme is inactive. Choose products packed in juice rather than syrup and with no preservatives.
• Fresh fruit, briefly heated. Chop the fruit and hold it at around 70 to 80 °C for 10 to 15 minutes, then cool. This also reduces wild yeast and bacteria from the skin.
• Fruit added to the hot side. Pineapple added to the end of the boil or the whirlpool is heat treated, but some aroma is lost.

Heating does dull the fresh character a little. Many brewers accept that in return for foam that lasts.

Fresh fruit carries its own microbes

The skin of a pineapple carries wild yeast and bacteria. Proof of how lively they are is tepache, a traditional Mexican drink made by fermenting pineapple peel with sugar and water, no added yeast needed. That is charming in a jar and unwelcome in a beer you meant to keep clean.

Wash the fruit, cut away the skin with a sanitised knife on a clean board and keep the chopped flesh covered. Brief heating, as above, deals with what survives. If you want a deliberately wild pineapple beer, treat it as a separate project with its own fermenter and tubing.

How much to use in a 20 litre batch

For a noticeable pineapple character in a 20 litre batch, 2 to 3 kg of prepared fresh fruit, or around 2 litres of juice, is a reasonable starting point. A sour or fruit-forward wheat beer can take more. Start lower, taste and add more in a second dose if you need it.

Pineapple sugar ferments almost entirely, so it adds alcohol and dries the beer rather than leaving it sweet. Add the fruit after the most vigorous fermentation has passed so the aroma is not driven off. Leave headspace for the extra activity.

Indian pineapple is plentiful and good

India grows pineapple across the North East, Kerala, Karnataka and West Bengal. Kew and Queen are the most common varieties. Queen is smaller, sweeter and more aromatic. Kew is larger and juicier, with more acidity. Both brew well.

Choose fully ripe fruit that smells strongly of pineapple at the base. Under-ripe pineapple adds acidity without much aroma. In the monsoon, when fruit is cheap and plentiful, a pineapple wheat beer makes a fine seasonal brew.

Hops and yeast can echo the fruit

You can build pineapple character without any fruit at all. Vic Secret is well known for pineapple aroma. Several other modern hops carry tropical notes. Our guide to Galaxy and Vic Secret covers that pair. Some yeast strains also give tropical esters.

Combining real fruit with a tropical hop in the whirlpool or dry hop gives a fuller pineapple flavour than either alone. Pineapple also pairs well with chilli, mint and coconut if you want to experiment further.

Brew one simple pineapple wheat beer

Start with a basic wheat beer, about half wheat malt and half pilsner malt, at around 1.045. Ferment with a clean ale yeast. Once fermentation slows, add 2 kg of chopped, briefly heated pineapple in a sanitised mesh bag. Rack off the fruit after five to seven days, then bottle. Pour one glass straight away and one a week later. Check how the foam holds. If it collapses, use canned fruit next time and compare.

Common questions

Why does pineapple kill beer foam?

Fresh pineapple contains bromelain, an enzyme that breaks down the proteins that build and hold foam.

Can I use canned pineapple in beer?

Yes. Canned pineapple and pasteurised juice have been heated, so the bromelain is inactive. Choose fruit packed in juice without preservatives.

How much pineapple should I add to 20 litres of beer?

Around 2 to 3 kg of prepared fresh fruit, or about 2 litres of juice, is a good starting point.

Which hops taste like pineapple?

Vic Secret is the best-known example. Several other modern hops also carry tropical notes.