Ask Ottolenghi: what can I use instead of soy?
Briefly

Seeing as you're vegetarian, though, some of the more common alternatives won't work, because many of them contain fish: Worcestershire sauce, say, or oyster or fish sauce.
Adding either of these to soup, stock or whatever else you're cooking will bring a real umami kick to proceedings.
Read at www.theguardian.com
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