Preserved lemons — hamad m'rakad in Darija — are whole or quartered beldi lemons packed in salt and their own juice, then left to cure for four to eight weeks. The process converts the bitter white pith into something soft, silky, and strangely mellow, while concentrating the aromatic compounds in the zest into a flavour that is simultaneously salty, floral, and intensely lemony without being sour.
The beldi lemon (بلدي, meaning "country" or "traditional") is the key. These thin-skinned Moroccan lemon varieties — descended from landraces cultivated here for centuries — have almost no pith. That means after months in brine, the rind genuinely dissolves into dishes rather than leaving a chewy, bitter piece of skin. You will find beldi lemons in season from October through April, often cheaper than imported varieties and piled high in market stalls.
When buying preserved lemons in the souk, open the jar and smell before committing. The correct scent is bright citrus over a rounded, fermented base — think mellow rather than sharp. A jar that smells sour, sharp, or chemically acidic has either been rushed (less than four weeks in salt) or made from thick-skinned imported lemons that never quite mellow properly. The rind should give slightly to pressure but hold its shape.