food customs with versatile and distinct ingredients. Abundant rice and vegetables are produced from the fertile Sichuan Basin, whereas a wide variety of herbs, mushrooms and other fungi prosper in the highland regions. Pork is overwhelmingly the most common type of meat consumed. Beef is somewhat more common in Sichuan cuisine than it is in other Chinese cuisines, perhaps due to the prevalence of oxen in the region. Sichuan cuisine also uses various bovine and porcine organs as ingredients, such as intestine, arteries, head, tongue, skin and liver, in addition to other commonly used portions of the meat. Rabbit meat is also much more popular in Sichuan than elsewhere in China. It is estimated that the Sichuan Basin and Chongqing area are responsible for about 70 percent of China's total rabbit meat consumption. Yoghurt, which probably spread from India through Tibet in medieval times, is consumed among the Han Chinese. This is an unusual custom in other parts of the country. The salt produced from Sichuan salt springs and wells, unlike sea salt, does not contain iodine, which led to goiter problems before the 20th century. Sichuan cuisine often contains food preserved through pickling, salting and drying. Preserved dishes are generally served as spicy dishes with heavy application of chili oil. The most unique and important spice in Sichuan cuisine is the Sichuan pepper (). Sichuan peppercorn has an intense fragrant, citrus-like flavour and produces a "tingly-numbing" () sensation in the mouth. Other commonly used spices in Sichuan cuisine are garlic, chili peppers, ginger and star anise. Broad bean chili paste () is one of the most important seasonings. It is an essential component to famous dishes such as Mapo tofu and double-cooked pork slices. Sichuan cuisine is the origin of several prominent sauces/flavours widely used in modern Chinese cuisine, including: Yuxiang (魚香) Mala (麻辣) Guaiwei (怪味) Other examples of mixed flavor including spicy and hot (Mala), fish flavor (Yuxiang), hot and sour, the five spices (Wuxiang; 五香), ginger juice, mashed garlic, sweet and sour, spice salt (Jiaoyan; 椒盐), dried tangerine or orange peel (Chenpi; 陈皮), burnt chili, pot-stewed fowl (Lu; 卤味), odd flavor (Guaiwei; 怪味), and other recombinations of these seasonings. Common preparation techniques in Sichuan cuisine include stir frying, steaming and braising, but a complete list would include more than 20 distinct techniques. Meal styles Sichuan hotpot, the most famous Chinese hotpot, is one of the representative dishes