Ramen is a Hybrid Chinese noodle dish presented in a Japanese way, and there are many regional variations featuring local specialities. This is a legendary Tokyo version.
To make the soup stock, bruise the spring onions and ginger by hitting with the side of a large knife or a rolling pin. Pour 1.5 litres/2½ pints/6¼ cups water into a wok and bring to the boil. Add the chicken bones and boil until the colour of the meat changes. Discard the water and wash the bones under water.