Why a Glut Is a Gift, Not a Problem

There comes a week in late summer when the courgette bed becomes faintly unreasonable, the plum tree sheds faster than anyone can eat, and the runner beans hang in bunches like green bunting. It is tempting to leave the surplus on neighbours' doorsteps and pretend it never happened. The older answer, and the better one, is to preserve it. Preserving turns a fortnight of plenty into a year of small pleasures: a spoonful of damson jam on January toast, a jar of piccalilli next to the cold ham at Christmas.

The three families of preserves divide the work neatly. Jam and fruit butter take the soft fruit, windfalls and gluts of berries. Chutney takes anything savoury and awkward — marrows, green tomatoes, windfall apples, the last of the beetroot. Pickles and vinegars take the crisp things: shallots, cucumbers, French beans, cauliflower. Between them they will absorb almost everything a generous garden can throw at you.

Get the Jars Right First

Everything else is cooking; this part is hygiene, and it matters more than any recipe. A jar that is not properly clean will spoil a batch of jam that took you two hours to make.

• Use jars with no chips or cracks, and always fit new lids. Reusing a lid that has held vinegar or chutney is false economy — the lining corrodes and the seal fails.
• Wash jars in hot soapy water, rinse well, then stand them upright in an oven at 140°C for 15 minutes. Do not put rubber seals, plastic lids or anything with a plastic gasket in the oven. A hot dishwasher cycle works just as well if you fill the jars while they are still warm.
• Ladle the preserve into hot jars, leaving 1cm of headspace for jam, 2cm for chutney, and enough vinegar to cover pickles by a clear centimetre.
• Seal immediately, leave to cool undisturbed, then label with the contents and the month. A jar of unlabelled brown preserve in March is a mystery nobody wants to solve.

Jam, Jelly and Fruit Butter

Jam sets at 104–105°C. If you own a jam thermometer, use it. If you don't, keep a saucer in the freezer, drop a teaspoon of jam onto it, wait a minute, and push it with your finger: if the surface wrinkles, it is ready. Under-set jam is not a disaster — call it fruit sauce and pour it over ice cream.

Some fruits carry enough pectin to set alone: blackcurrants, gooseberries, redcurrants, cooking apples, plums. Others — strawberries, rhubarb, cherries, elderberries — need help. Add the juice of a lemon per kilo, or simmer a handful of gooseberries or crab apples in with them and fish out the skins. A rough guide is 750g to 1kg of sugar per kilo of prepared fruit, depending on how sweet the fruit is. Do not be tempted to cut the sugar much below that: sugar is a preservative as well as a sweetener, and less of it means a shorter shelf life.

Fruit butters are the forgiving cousin. Cook fruit down to a pulp, sieve it if you like, then simmer 1kg of pulp with 500g of sugar and a little cinnamon or ginger for an hour and a half, until a spoonful mounds on a cold plate. They thicken beautifully and use up fruit that is too bruised for jam.

Chutney: The Slow Simmer

Chutney rewards patience and punishes haste. A reliable formula by weight is 1kg of prepared fruit and vegetables, 500g of sugar, 500ml of vinegar at 5% acidity, a tablespoon of salt, and whatever spices you favour — mustard seed, ginger, allspice, a chilli or two. Chop everything to a similar size, simmer gently for one and a half to three hours, and stir often once it starts to thicken.

It is ready when a wooden spoon drawn across the base of the pan leaves a channel that holds for a second or two before the mixture creeps back. Pot it hot, then leave it for four to six weeks before eating. The sharpness settles and the flavours marry; a chutney eaten the day it is made will taste thin and vinegary and you will think you have failed. You haven't.

Pickles, Vinegars and Brining

Use vinegar of at least 5% acetic acid — check the label, as some supermarket own-brands are weaker, and do not dilute it. For pickled onions, brine them first in a solution of 50g of salt to 1 litre of water for 12 to 24 hours, then rinse and pack into jars. Cover with spiced vinegar: cold for a crunchy onion that keeps its bite, hot for a softer, quicker pickle.

Cucumbers and gherkins go limp without help. Adding a vine leaf, a horseradish leaf or even a single tea leaf to each jar supplies tannin, which keeps them crisp. Beetroot should be cooked and peeled before pickling; French beans and cauliflower benefit from a brief blanch. Ready in two to four weeks.

Storing, Labelling and Checking

Keep jars somewhere cool, dark and dry — a north-facing cupboard or a proper pantry shelf. A sealed jar will show a slightly concave lid that does not flex when pressed. Any jar that has not sealed should go straight into the fridge and be eaten within two or three weeks.

If a jam grows a spot of mould, throw the whole jar away rather than spooning off the top; the mould's threads run deeper than you can see. Beyond that, high-acid preserves are among the safest things you can make at home, provided you do not reduce the vinegar or the sugar in the recipe. Do that, and you can fill a shelf with the summer and eat it slowly all winter.