Salt-preserved lemons

About this recipe

Salt-preserved lemons are one of the oldest Mediterranean preserves — a slow transformation in which salt and the lemons' own juice ferment the peel until it becomes soft, intense and fragrant. The peel is the part you use, finely chopped into tagines, salad dressings, marinades for roasted vegetables, or alongside couscous and quinoa.

The process needs no boiling, sterilising or special equipment — just a clean jar, good lemons, and patience. After 4-6 weeks at room temperature, the preserve is ready and then keeps for months in the fridge.

Ingredients

For a 1 l jar

• Coarse salt (pickling, non-iodised) — for the bottom of the jar and salting the lemons, roughly 1 tbsp per lemon
• 6 whole lemons, organic or untreated, well washed
• 4-5 extra lemons for the topping-up juice

For a 2 l jar

• Coarse salt (pickling, non-iodised)
• 12 whole lemons, organic or untreated, well washed
• 8-10 extra lemons for the topping-up juice

Important: the whole lemons going into the jar must be organic or untreated because we use the peel, which on conventionally treated lemons holds pesticides and waxes. The lemons for the topping-up juice can be ordinary ones — we only use the juice.

Method

1. Prepare the jar

Wash the jar in hot soapy water, rinse well and dry completely. Spread an even layer of coarse salt across the bottom — roughly 1 tbsp for a 1 l jar, 2 tbsp for a 2 l one.

2. Prepare the lemons (10 min)

Wash the lemons thoroughly under running water, scrubbing them with your hand to remove any residue from the peel.

Cut off the stem end (top), about 0.5 cm — set aside.

Stand the lemon with the cut end up and slice down crosswise, without separating it completely — keep a 1-2 cm base intact at the bottom. The lemon should open up like a four-petalled flower but stay whole.

3. Salt the inside (10 min)

With a teaspoon, pack coarse salt generously inside each cut lemon — at least 1 teaspoon per lemon, more is fine. Rub the salt into the inner walls of the wedges. Salt the cut stem end too.

4. Pack the jar

Place the salted lemons in the jar one at a time, pressing them down gently with your hand or the back of a spoon to release their juice and pack them as tightly as possible. As you press, their own juice starts running out and filling the spaces between them.

Tuck the salted stem ends in on top.

5. Top up with lemon juice

Squeeze the remaining lemons and pour the juice into the jar until all the lemons are completely submerged in liquid. This step is essential — any piece sticking out above the liquid can develop mould.

If the juice doesn't quite cover everything, squeeze a few more lemons. Leave 1-2 cm of headspace below the lid.

6. Seal and ferment (4-6 weeks)

Seal the jar tightly and keep at room temperature, away from direct sunlight, for 4-6 weeks.

In the first week, open the jar every 1-2 days to release the pressure that builds up from fermentation and to check the liquid level. Tip the jar gently upside down and back to redistribute the salt and juice.

The lemons are ready when the peel becomes soft and translucent and the liquid takes on a slightly syrupy texture. Taste a small piece of peel — it should be intensely salty, fragrant and free of raw bitterness.

7. Storage after fermentation

After 4-6 weeks, move the jar to the fridge. Salt-preserved lemons keep there 6-12 months, deepening in flavour over time.

Notes & tips

How to use them

You mainly use the peel, not the flesh. Take a lemon out of the jar, rinse it briefly under cold water if you want to reduce the salt, separate the peel from the flesh with a knife, and chop the peel very finely or into thin strips.

Use it in:

• Tagines with chickpeas and olives
• Salad dressings — chopped peel + olive oil + garlic + fresh herbs
• Marinade for roasted vegetables — cauliflower, courgettes, aubergines
• Couscous and quinoa — added at the end for tangy-salty contrast
• Hummus and bean dips — instant flavour
• Stews and braises — adds salt and acidity in one go

The leftover flesh and juice aren't wasted — use them sparingly in soups, sauces or dressings as a combined salt-and-acid replacement.

Why coarse non-iodised salt

Iodised salt can darken the lemons and gives a slightly metallic taste. Fine salt dissolves too quickly and doesn't allow the gradual extraction of juice. Coarse pickling or sea salt is ideal — without anti-caking agents.

Mould — how to prevent it

The only real risk is mould, which only appears when the lemons aren't completely submerged in liquid. If you notice a white film on the surface in the first few days, it may just be crystallised salt or kahm yeast — harmless, can be wiped off with a clean spoon. If coloured mould appears (green, black, pink), throw the whole jar away.

Choosing the lemons

Organic lemons with thin peel and abundant juice give the best results. Meyer lemons (sweeter, thinner peel) are excellent. Lemons with very thick peel can leave the flesh bitter after fermentation — choose medium-sized, firm lemons.

Aromatic variations

You can add to the jar, for variation:

• 2-3 bay leaves
• 1 cinnamon stick
• 4-5 black peppercorns
• 1 tsp coriander seeds
• A few sprigs of thyme or rosemary

The aromatics transfer their fragrance to the lemons during fermentation. The plain salt-only version stays the most versatile for everyday cooking.