Tonkotsu ramen is a popular dish in Japan that is made with a rich and creamy pork bone broth. The broth is typically simmered for several hours to extract the flavor from the bones. The noodles are thin and curly, and are made with wheat flour. The toppings can vary, but typically include sliced pork, green onions, and bamboo shoots. This dish can be a bit more challenging to make at home due to the time required to make the broth, but the end result is well worth it.