Pho Thin is a popular restaurant in Hanoi that serves Pho, a traditional Vietnamese noodle soup. The restaurant is known for its unique recipe, which includes stir-fried beef and onions, giving the soup a smoky flavor. The soup is served with fresh herbs, lime, and chili, allowing customers to customize the taste to their liking. The restaurant has been around for over 40 years and is a favorite among locals and tourists alike.