You can buy Harissa in well-stocked supermarkets or Middle Eastern grocery stores. However, making your own sauce gives you creative control of which chiles and spices you use. Our version uses a mixture of Ancho and New Mexican chiles, as well as freshly roasted red peppers. We love this with our Harissa Deviled Eggs (see below), but you can also serve it with fish, meat, or roasted veggies.