Seolleongtang is a hearty, milky white soup made by simmering ox bones for hours. When preparing seolleongtang, beef bones, usually from the leg, simmer for hours in a pot. The low and slow method extracts all the flavors, fat, and nutrients from the bones. The result is a milky white broth that is both hearty and comforting. Beef brisket, sliced green onions, and seasonings are often added to the simple broth. These seasonings include salt, pepper, and red pepper. While simple, the soup pairs well with kimchi, banchan, and rice.