A bag of lemons bought for one recipe. Three limes left over from a Friday night. A fruit bowl that looks fine on Monday and doubtful by Thursday. Citrus is one of the most wasted things in a British kitchen, and one of the easiest to keep. Salt, a low oven and the freezer will each turn a glut into something you can reach for months later — and in the case of salt, something with a flavour all of its own.
Start with fruit worth keeping
Look for unwaxed fruit, since you will be eating the peel. If waxed lemons are all that's on offer, scrub them under warm water with a little bicarbonate of soda and a vegetable brush, then dry them properly. Thin-skinned fruit packs more tightly into a jar and softens faster in salt. Anything with soft brown patches or a faint smell of damp should go to the compost — one tired lemon will take a whole jar down with it.
Salt-preserved lemons and limes
This is the method that changes the fruit rather than simply storing it. Salt softens the rind, blunts the bitterness and leaves you with something savoury, mellow and gently sour — the ingredient that makes a lamb tagine taste like it came from a restaurant rather than a Tuesday.
The basic method
- Sterilise a clean jar: wash it in hot soapy water, rinse well, and dry it in a low oven at about 110°C for ten minutes. Fill it while it is still warm.
- Cut each lemon lengthways into quarters, stopping about a centimetre short of the base so the fruit stays attached in one piece.
- Rub coarse sea salt into every cut face and into the cavity — roughly a tablespoon per lemon. Unrefined sea salt is better than table salt here, which contains anti-caking agents that can cloud the brine.
- Pack the fruit into the jar, pressing down firmly with a clean hand or the end of a rolling pin until juice begins to rise.
- Add a couple of tablespoons of extra lemon juice if the fruit isn't fully covered. Everything must sit below the liquid.
- Seal, label with the date, and leave somewhere cool and dark for three to four weeks. Shake the jar daily for the first week, then once a week after that.
The lemons are ready when the rind gives easily to a fingernail. The brine will look slightly syrupy and smell cleanly sour — that is exactly what you want.
Limes, and what to add to the jar
Limes follow the same method but soften more quickly, often in two to three weeks. Halve or quarter them; their thinner rind means they need a lighter hand with the salt. The result is sharper and more floral than preserved lemon, and very good chopped into yoghurt, whisked into a dressing for grilled fish, or stirred through rice. Add two or three of the following to either jar: a bay leaf, black peppercorns, coriander seeds, a dried chilli, a cinnamon stick, a strip of orange peel. Keep it restrained so the citrus still leads.
Using preserved citrus
Rinse the salt off before you use it. Chop the rind finely and stir it through slow-cooked lamb, chickpeas, couscous or a vinaigrette, or mash it into butter for roast chicken. The pulp underneath is soft and salty; taste it before adding, then use it wherever you would use salt and lemon together. In a cool cupboard, a jar keeps for a year. Once opened, move it to the fridge and top up with lemon juice so the fruit stays submerged. If you see fuzz, or the brine smells yeasty rather than clean, throw the jar out.
Drying citrus for zest, slices and powder
Air-drying is unreliable in most British kitchens — a damp autumn will give you mouldy peel long before crisp peel. A low oven does the job in an afternoon, and a dehydrator does it with less watching.
- Zest strips. Pare the peel with a vegetable peeler, leaving the white pith behind. Spread the strips on a tray lined with baking parchment and dry at 50–60°C for two to four hours, propping the oven door open with a wooden spoon so moisture can escape. They are done when they snap rather than bend.
- Slices. Cut 3–4mm thick, blot with kitchen paper, then dry at 60°C for four to six hours, turning once. Aim for leathery and completely dry, with no soft patches near the centre.
- Powder. Blitz cooled dried zest in a spice grinder and sieve it. Half a teaspoon sharpens shortbread, spice rubs, marinades and icing.
Cool everything completely before it goes into a jar, then store it in a dark cupboard away from the hob. A small food-safe silica sachet helps in a steamy kitchen. Dried zest holds its punch for around six months, then fades quietly, so label it and use the oldest first. Dried slices are best for drinks: drop one into hot water with a spoonful of honey, or simmer a few into a syrup.
Freezing: the least effort of all
- Zest first. Grate or pare the peel while the fruit is still fresh, then freeze it in small bags. Sprinkle straight from frozen into cake batter or a marinade.
- Juice in cubes. Squeeze and strain into an ice cube tray; one cube is roughly a tablespoon, which is about right for a vinaigrette or a gin and tonic. Bag the cubes once solid.
- Wedges and halves. Freeze on a tray first so they don't clump, then transfer to a bag. Useful for drinks, roasting and squeezing over fish.
- Whole fruit. Freeze whole in a bag for juicing later on. The skins go soft, so they are no good for slicing, but they thaw perfectly well for cooking.
Which method for which job
- Zest for baking and dressings — dry or freeze.
- Juice for cooking and drinks — freeze in cubes.
- Rind to cook with, as a seasoning in its own right — salt-preserve.
- Slices for hot drinks, syrups and decoration — dry.
Start with one jar and one tray
Don't attempt all three methods in a single weekend. Buy the reduced bag of lemons, spend ten minutes salting it into a jar, and freeze the zest from the next two limes you use for something else. That jar will carry you through the months when imported lemons are pale and expensive, and freezing zest becomes automatic once it is a habit. The fruit bowl stops being a countdown and starts being a store cupboard.
Photo: Ajale / Pixabay
