Som Tum, also known as green papaya salad, is a refreshing and spicy salad that is a staple in Thai cuisine. It is made with shredded green papaya, tomatoes, green beans, peanuts, and chili peppers, all mixed together in a tangy dressing made from lime juice, fish sauce, and palm sugar. The combination of flavors in Som Tum is both sweet and sour, with a hint of spiciness. It is a popular street food in Chiang Mai and can be found at many local markets and food stalls.