Sagol or Subyeo is Korean for "Ox bones" . Ox bones is mostly used to make Seolleongtang (Ox bone soup) . Ox bone soup is very popular all year round and a staple food in Korea, but most especially in cold winter time. The best milky broth is achieved by simmering the ox bones for hours and hours. Sagol or ox bone is very expensive in Korea. Maneul Seolleongtang (garlic Ox bone soup) is another Korean dish which makes use of Ox bones. Sinseon Seolnongtang is a restaurant specializing in Seolnongtang (Ox-bone soup). The restaurant has gained in popularity, expanding nationwide because of their sweet and rich broth made of ox bones.