Muhammara is a spicy-tart dip for flatbread made from walnuts and roasted red peppers. The name comes from the Arabic word for reddened, and the dish originated in Syria, where it often is served alongside hummus and baba ganoush. Aleppo pepper is made from ground dried Halaby chilies; it tastes subtly of cumin and fruit, with only mild heat. Look for it in well-stocked markets and spice shops, but if you cannot find it, simply leave it out—the muhammara will still be delicious. Serve with flatbread or vegetables for dipping or use as a sandwich spread.