"Gai yang is a street food from north-east Thailand. However, it's so delicious it's found throughout the country. Often eaten with green papaya salad and sticky rice, this is the quintessential Issan meal. The traditional recipe uses a whole chicken, split open and flattened, rubbed with marinade and grilled over charcoal until beautifully fragrant. This recipe is adapted from The Elegant Taste of Thailand by Pinyo Srisawat and Sisamon Kongpon." You'll need to begin this recipe a day ahead.