Raib (raïb) is Morocco’s everyday fermented milk: whole milk left to sour and thicken into a soft, spoonable, mildly tangy curd, eaten cold – plain, with sugar or honey (no honey for babies under 1), or with bread. Unlike yogurt, it sets at room temperature, because the bacteria that make it prefer moderate warmth.
What Makes Raib
When researchers screened 74 samples of traditional raib, the lactic acid bacteria they isolated were Lactococcus lactis, Enterococcus faecium and Enterococcus faecalis; some produced bacteriocins active against Listeria, and the strains coagulated milk at 30°C within 24 hours (Elotmani et al., 2002). A larger survey of Moroccan traditional dairy products found the same picture – Lactococcus lactis, Leuconostoc mesenteroides, enterococci and Lactiplantibacillus plantarum dominating (Gardoul et al., 2025).
These are mesophilic bacteria – the same family that makes cultured buttermilk, Swedish filmjölk or South African amasi. Yogurt, and the Caucasus fermented milk matsoni, are made by heat-loving (thermophilic) bacteria that need 40–45°C. That’s why a yogurt starter left on the counter makes a poor raib, and why the starter below is live cultured buttermilk.
Raib, Lben and Jben
Raib is whole fermented milk. Lben is the traditionally fermented skimmed milk left after the butter has been churned out of soured milk – a thin, sour drink (Ouadghiri et al., 2009) – and that butter, salted and aged, becomes smen. Jben is a fresh cheese. Similar fermented milks are made across North Africa and the Middle East under related names such as rayeb.
Making It Safely at Home
Traditionally raib starts from raw milk souring on its own. Raw milk can carry harmful bacteria, and fermentation doesn’t reliably make it safe (CDC), so use pasteurized whole milk and give it a strong start with a live culture: a few spoonfuls of cultured buttermilk whose label says it contains live cultures, or a dried mesophilic starter. Then keep it at moderate room temperature, 20–26°C, until it has set – usually 12–24 hours – and refrigerate (recipe card below). Ultra-pasteurized milk works but sets softer.
Discard a batch that hasn’t thickened or soured by 24–30 hours, or that turns pink, slimy, moldy or smells unpleasant: it means the culture didn’t take over. Keep 2–3 tablespoons of each good batch, refrigerated, to start the next one within a week.
Lactose and Live Cultures
Raib made this way contains live lactic acid bacteria. Live cultures in fermented milk help digest lactose – the European Food Safety Authority accepted that claim for yogurt cultures (EFSA, 2010) – so many people who struggle with milk find fermented milks easier. Similar drinks thinned with water and salt include Turkey’s ayran.