The sauce cooks down so thick and dark that it's often served with the meat still on the bone, meant to be pulled apart and dunked rather than sliced.
Dried, ground jute-mallow leaves are cooked for hours with beef or lamb until the stew turns a deep, near-black green and thickens to a glossy consistency. It's ladled over bread or couscous at the small gargotes around the Tunis medina.