Som Tom is a traditional Thai dish made from shredded unripe papaya, tomatoes, green beans, peanuts, and chili peppers. It is commonly known as green papaya salad. The other options listed are different Thai dishes: Gai yang is grilled chicken, Laab Moo is a spicy minced pork salad, and Satay Gai is grilled chicken skewers. Therefore, the correct answer is Som Tom.