Oranges, the exotic fruit that forms the basis of all Triple Sec, were originally from the Indies and China. The crusades introduced them to Europe from Palestine via Portugal. The original orange “curacao” was made with fruit from the Island of Curacao. However, the term now embraces a wide variety of liqueurs made from oranges and other produce as well. Amsterdam Curacaos are perhaps the most famous and highly regarded. (The Bols company comes to mind.)