oyster sauce

oyster sauce substitution

I would like to try bento n1 but I do not have oyster sauce: I found this recipe for a substitution http://www.grouprecipes.com/sr/26039/vegetarian-oyster-sauce-by-byranna-... and I would like if you think it would work... or maybe there is something else I could use instead of oyster sauce (which actually I have never tried before..)?