Roselle juice, known as bissap, wonjo, foléré, dabileni, tsobo, zobo, or sobolo in parts of africa, sorrel in the caribbean, and agua de jamaica in mexico, is a drink made out of the flowers of the roselle plant, a variety of hibiscus. although generally the "juice" is sweetened and chilled, it is technically an infusion and when served hot can also be referred to as hibiscus tea.
Source: Wikipedia