If you're looking to swap in an ingredient for soy sauce but feel confused by the idea of liquid seasoning, you're not alone.

It can take four years to make one batch of barrel-aged soy sauce. The natural fermentation ... the authentic version of Japan's staple seasoning. More from Still Standing It can take four years ...

To make this sauce in a food processor, add all the ingredients and blitz until thoroughly combined. Adjust the seasoning to taste and leave to stand for at least 30 minutes before serving.