to Bangkok in 1822, writes in his account of the journey: "The fruits of Siam, or at least of the neighbourhood of Bangkok, are excellent and various, surpassing, according to the experience of our party (...) those of all other parts of India." The Siamese themselves consume great quantities of fruit, and the whole neighbourhood of Bangkok is one forest of fruit trees. Fruit is not only eaten on its own, but often served with spicy dips made from sugar, salt, and chilies. Fruits feature in spicy salads such as som tam (green papaya salad) and yam som-o (pomelo salad), in soups with tamarind juice such as tom khlong and kaeng som, and in Thai curries such as kaeng khanun (jackfruit curry), kaeng phet pet yang (grilled duck curry with pineapple or grapes), and kaeng pla sapparot (fish and pineapple curry). Fruits are also used in certain Thai chili pastes, such as in nam phrik long rue made with madan (a close relative of the mangosteen), and nam phrik luk namliap, salted black Chinese olive chilli paste. Although many of the exotic fruits of Thailand may have been sometimes unavailable in Western countries, Asian markets now import such fruits as rambutan and lychees. In Thailand one can find papaya, jackfruit, mango, mangosteen, langsat, longan, pomelo, pineapple, rose apples, durian, Burmese grapes and other native fruits. Chanthaburi in Thailand each year holds the World Durian Festival in early May. This single province is responsible for half of the durian production of Thailand and a quarter of the world production. The Langsat Festival is held each year in Uttaradit on weekends in September. The langsat (Lansium parasiticum), for which Uttaradit is famous, is a fruit that is similar in taste to the longan. From the coconut comes coconut milk, used both in curries and desserts, and coconut oil. The juice of a green coconut can be served as a drink and the young flesh is eaten in either sweet or savory dishes. The grated flesh of a mature coconut is used raw or toasted in sweets, salads and snacks such as miang kham. Thais not only consume products derived from the nut (actually a drupe), but they also make use of the growth bud of the palm tree as a vegetable. From the stalk of the flowers comes a sap that can be used to make coconut vinegar, alcoholic beverages, and sugar.