This one from Tesco is only 20 per cent soy sauce extract. The rest is water, salt, three different types of sugar and additives.' According to its ingredient list published by the retailer ...

Ohama notes that soy sauce produced in Kyushu is slightly less salty than the types made in eastern Japan. He says soy sauce from Kanto contains enough salt so that even a small amount of it can ...

Which of the two you use is up to you, but for both types, ask the butcher to cut them ... then put the chillies into the pot. Add the soy sauce, rice wine, cinnamon sticks, star anise, sugar ...