Crossword Genius

Vegan's protein souce (4)

Ross

I believe the answer is:

tofu

(Other definitions for tofu that I've seen before include "Unfermented soya bean curd" , "soybean curd" , "Soy bean curd" , "Cheese-like vegetarian food" , "fare from Japan" .)

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