Foraging Sloe Berries for Winter Gin

Wait for the Frosts Before You Pick

Sloes are the fruit of the blackthorn, and they are almost impossible to enjoy straight from the hedge. Raw, they are mouth-puckeringly astringent, with a dry, furry quality that seems to strip the inside of your cheeks. That astringency comes from tannins, and it softens with cold. Traditional wisdom says you should not pick sloes until the first frosts have passed over them, and while you can cheat with a freezer, there is something pleasing about working to the rhythm of the season.

In most of the UK, sloes ripen from late September, but they are at their best from late October through November, once a few sharp nights have mellowed them. The fruit is ready when it is fully blue-black with a dull, powdery bloom, and when it gives slightly under a fingernail. If the berries are still hard and green-tinged, leave them another fortnight. A sloe gin made with underripe fruit tastes thin and harsh, and no amount of sugar will rescue it.

Finding Sloes in the Hedgerow

Blackthorn is a hedgerow stalwart, and once you can recognise it you will spot it everywhere along country lanes, field edges, railway cuttings and the boundaries of old pastures. Look for a dense, dark, spiny shrub with small oval leaves and a blackish bark. The giveaway is the thorns: long, needle-sharp and plentiful, growing on the twigs rather than the trunk. Slopes and hedges on chalky or clay soils tend to crop heavily, and a good bush can carry several kilos.

A few sensible rules for foraging:

• Never pick from roadside verges that may have been sprayed or where exhaust pollution is heavy.
• Ask permission if the hedge sits on private land, and take only what you need from each bush.
• Leave plenty of berries for fieldfares, redwings and other winter thrushes.
• Wear gloves and a thorn-proof jacket, because blackthorn draws blood with little encouragement.
• Check the fruit carefully for maggots; a small hole near the stalk is a bad sign.

Do not confuse sloes with hawthorn berries, which are red and contain a single large stone, or with damsons, which are larger, sweeter and grow on trees rather than thorny shrubs.

Pricking, Freezing and Preparing

The old instruction is to prick each sloe with a needle or a silver fork so the skins split and the flavour can escape into the gin. It is a genuinely tedious job, and there is a much easier route: spread the washed berries on a tray and freeze them overnight. The ice crystals rupture the cell walls just as effectively, and the fruit defrosts into soft, wrinkled little purses that infuse beautifully. If you cannot bear to wait for a frost, the freezer is your friend.

Whichever method you choose, rinse the sloes, pick out any leaves, stalks and damaged fruit, and pat them dry. Some people add a few drops of almond essence or a split vanilla pod to round off the flavour. Both work well, but use them sparingly; sloe gin should taste of sloes first and foremost.

The Sloe Gin Recipe

You need three things in roughly equal volume, though opinions differ on the sugar. A reliable starting point for a one-litre batch:

• 500g sloes, pricked or frozen and thawed
• 250g caster sugar (up to 350g if you like it sweeter)
• 1 litre of gin, a plain, inexpensive London dry

Sterilise a large Kilner jar or two smaller ones with boiling water and let them dry. Tip in the sloes and sugar, pour over the gin, and seal. Give the jar a good swirl. The sugar will settle in a thick layer at the bottom, which is entirely normal; it will dissolve as you shake the jar.

Do not be tempted to buy premium gin for this. The sloes, sugar and time do most of the work, and a decent supermarket own-brand is more than good enough. Save the fancy bottle for the glass in your hand.

Shaking, Straining and Timing

Store the jar somewhere cool and dark, and shake it every day for the first week, then once or twice a week for the next two to three months. The liquid will deepen from pale gold to a rich ruby-red, and the berries will fade to a dull grey-brown as their flavour transfers to the gin.

Taste it after eight weeks. If it is still sharp, leave it another fortnight. When you are happy, strain through a muslin-lined sieve or a clean tea towel, then bottle in sterilised bottles and label with the date. Sloe gin improves with age, so if you can bear to wait until Christmas, you will be well rewarded. It also makes an excellent gift, especially decanted into small bottles with a handwritten tag.

Variations and Making the Most of Your Haul

Once you have mastered the basic method, the variations are endless. A cinnamon stick and a couple of cloves make it more festive; a strip of orange zest lifts the fruit; a handful of damsons added alongside the sloes gives a rounder, softer result. Some foragers add a spoonful of honey instead of half the sugar for a gentler sweetness.

Do not throw away the drained berries. They are too boozy to eat by the handful, but they make a superb base for sloe gin jelly, a rich sauce for venison or duck, or a spoonful stirred through apple crumble. A jar of sloe gin and a bottle of your own homemade liqueur on the sideboard is one of the quiet pleasures of a rural winter, and it all begins with a frosty afternoon in the hedge.