Couscous can be bought in instant and pre-cooked versions, but ignore them as these will turn into mush when cooked. Instead, choose non-instant couscous (available at most Middle Eastern grocers). It will take longer to cook and is traditionally steamed in a couscoussière, which houses the necessary mesh-steamer inside a pot in which a flavourful broth or stew is simmered. If you cannot find a couscoussière, use a regular steamer and line the steamer basket or colander with a muslin cloth or dish towel. Couscous is traditionally served alongside a tagine or stew.