Khao soi is a rich, creamy Northern Thai coconut curry noodle soup, famous in Chiang Mai, featuring tender meat (like chicken drumsticks or shrimp) in a fragrant curry broth, served with crispy fried noodles on top for texture. It's garnished with fresh lime, shallots, cilantro, and pickled mustard greens, allowing for a balance of spicy, sour, and savory flavors.