Kamut, otherwise known as khorasan wheat, is an ancient grain. The grains are quite large (sometimes up to three times bigger than modern wheat) and have a buttery kind of taste that works well with really big flavours (harissa, preserved lemons, blush tomatoes, green olives), though you do have to soak it overnight before cooking. You can find kamut in wholefood stores or online. Or use spelt, farro or barley.