Preserving Autumn Fruit in Glass Jars

The Case for Glass

By the end of September the kitchen windowsill is crowded, the freezer is groaning and there is a limit to how much crumble one household can reasonably eat. Bottling is the old answer, and still the best one. Fruit preserved in glass holds its shape — proper halves of pear, plum halves with the stone scar neat in the middle — and it keeps on a shelf rather than in a chest freezer. Open a jar in February and you get September, not the faintly flat taste of something that thawed too slowly. There is also a quiet satisfaction in a pantry shelf of labelled jars, standing in rows like a small library of the year.

Choosing and Sterilising Your Jars

Any glass jar that has held commercial produce can be reused, provided the rim is free of chips and the lid still seals properly. Two-part metal lids are ideal, and jars with rubber sealing rings and a metal clip are excellent for fruit. Avoid anything that once held oily or strongly spiced food — the smell lingers in the seal.

Wash jars in hot soapy water, rinse well, then sterilise either in an oven at 140°C for twenty minutes, standing upright on a baking tray, or by boiling in a deep pan for ten minutes. Keep them hot until the moment you fill them. A cold jar can crack when hot syrup hits it, and warm glass packs fruit more kindly.

• Run a finger around every rim before you commit a jar to the shelf
• Discard any lid with rust, dents or a perished rubber ring
• Sterilise more jars than you think you need — fruit always goes further than expected
• Keep lids in a pan of hot water, not boiling, so the sealing compound stays soft

Fruit, Syrup and Neat Packing

Pick fruit slightly underripe. Firm flesh holds its shape through the water bath; a soft pear will collapse into mush. Peel, halve and core pears and drop them straight into water with a good squeeze of lemon to stop them browning. Halve and stone plums, or leave them whole and prick each skin twice with a darning needle. Peel, core and quarter apples — Bramleys soften more than Cox's, so give cookers a heavier syrup.

For syrup, dissolve sugar in water over a low heat and keep it hot. A medium syrup of 400g sugar to 1 litre of water suits most autumn fruit; use 250g for a light syrup and 600g for a heavy one. Honey can replace up to half the sugar, though it darkens pale fruit.

Pack the fruit cut side down, layering snugly but without crushing, and tap the jar on a folded cloth to settle it. Fill to within 2cm of the rim. Pour hot syrup over, then slide a chopstick or thin knife down the inside to release trapped air bubbles and top up. Wipe the rim with a cloth dampened in vinegar, fit the seal and lid, and screw to fingertip tight — firm enough to hold, loose enough to let air escape as the jar heats.

Processing in the Water Bath

Stand the jars on a rack in a deep pan, not touching one another or the base. Pour in warm water to cover the jars by 3–5cm and heat gently to 88–90°C, just below a simmer, for fruit. Hold it there and start timing once the water reaches temperature: around 20 minutes for jars up to 500ml, and 25–30 minutes for litre jars of pears, apples and quince.

• Never rely on a dry oven alone — dry heat does not drive out the air properly
• Keep jars upright at every stage, including lifting them out
• Use proper jar lifters rather than tongs, which slip at the worst moment
• Top up with hot water if the level drops below the jar shoulders

Lift the jars out and stand them on a wooden board away from draughts. Leave them completely undisturbed for twelve to twenty-four hours.

Testing the Seal and Storing Your Haul

Next morning, press the centre of each lid. It should be concave and should give no click. On a two-part lid, remove the screw band and lift the jar by the lid alone — if the seal holds, the jar is sound. Any jar that fails should go straight into the fridge and be eaten within a week, or be reprocessed within twenty-four hours with a fresh lid.

Label each jar with the fruit, the syrup and the date, and store them somewhere cool, dark and dry. They are best within twelve months, though well-sealed jars often keep far longer.

Opening the Jars

A good jar gives a small hiss as you break the seal. Check the smell before you taste, and check the underside of the lid for any bloom or discolouration. Serve the fruit over rice pudding or porridge, fold it into a crumble, or spoon it over yogurt with toasted oats. The syrup is far too good to pour away — reduce it for a glaze, stir it into a hot toddy, or use it to poach a second batch. Once opened, keep the jar in the fridge and eat within a week.