Cilantro soup is thin lightly flavored soup popularly made for winters. Cilantro is a spice which has a very soothing and refreshing taste which makes it ideal for flavoring soups meant for winters. A cilantro soup is stock based and is boiled with cilantro leaves and stalks, along with other vegetables, to extract its flavor. A very popular cilantro flavored soup is the Lemon Cilantro soup which is oriental in origin but relished worldwide.