Other popular tropical fruits include mangosteen, jackfruit, longan, lychee, rambutan, soursoup, pineapple and mango. The family recipe uses roasted goji berries, steamed jujubes, ganghwal, longan, and ginger juice. Dried longan are often used in Chinese cuisine and Chinese sweet dessert soups. During harvest, pickers must climb ladders to carefully remove branches of fruit from longan trees. The fruit is edible, with the longan ("D. longan") being grown commercially for fruit production. Potassium chlorate has been found to cause the longan tree to blossom. The main exports from Thailand are dried longan, fish oil, rubber products, and consumables. The only known preservative added to canned longan is sulfur dioxide, to prevent discoloration. The Longan tree produces light-yellow inflorescences at the end of branches. Many companies add preservatives to canned longan. Fresh longan that is shipped worldwide is exposed to sulfur fumigation. The Longan tree is somewhat sensitive to frost. Thurman married his lifelong partner Frances Longan Arnold on September 4, 1917. The longan is believed to originate from the mountain range between Myanmar and southern China.