Smen (salted, herbed butter)
Atlas households once kept jars of smen for months, even years, until the salted butter developed a pungent, almost blue-cheese aroma; a spoonful stirred into couscous, harira or a chicken tagine gives a depth nothing else can. Long ageing at room temperature is risky at home, so this is a safer fridge version: pasteurised unsalted butter is simmered with dried za'atar or oregano, strained, salted and then matured in the fridge for 2–4 weeks, which gives a mellow, nutty, faintly tangy smen rather than the fiercely strong old kind. For the real long-aged flavour, buy smen from a reputable shop. Use it a teaspoon at a time; it is meant as a seasoning, not a cooking fat. The mistake to avoid is leaving any milk solids or water in the butter, as that is what turns it rancid or mouldy rather than pleasantly aged. Chef's tip: strain it through muslin until perfectly clear; any milky bits left in the jar are what turn butter rancid.











