It can be soft or firm (4)

I believe the answer is:

tofu

(Other definitions for tofu that I've seen before include "'Soft white food, made of soy milk (4)'" , "fare from Japan" , "Soya bean food" , "Unfermented soya-bean curd" , "nosh for vegetarians" .)

I've seen this clue in The Wall Street Journal.

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