What are preserved lemons used for in Moroccan cooking?

Preserved lemons are, for me, the single ingredient that makes Moroccan food taste Moroccan. We call them l'hamd marakad, and they're made by quartering lemons almost to the base, packing them hard with coarse salt, and pressing them into a jar with extra juice until they're submerged. Over three or four weeks the salt and acid work their alchemy: the bitterness vanishes, the rind softens to silk, and the flavour becomes something extraordinary — bright, salty, floral and intensely lemony all at once.

Here's the secret that surprises first-timers: you mostly use the peel, not the pulp. The rind is rinsed, the soft flesh often scooped away, and then the peel is finely sliced or chopped and folded into the dish near the end of cooking so it keeps its perfume. That salty-sour lift is what cuts through rich, slow-cooked food and makes it sing.

The most famous home is the classic tagine of chicken with preserved lemon and green olives — golden, garlicky, glossy with saffron and ginger, with bursts of that electric citrus in every few bites. But once you start noticing it, preserved lemon is everywhere: chopped into zaalouk and other salads, stirred into the herby chermoula marinade for fish, layered into fish tagines from the coast, and tucked among braised vegetables.

I love taking guests to a spice or olive stall to see the great jars of them, and I always recommend buying a small jar to bring home — they keep for ages. One tip from every Moroccan cook I know: taste before you salt the rest of your dish, because preserved lemon brings plenty of salt with it.