Mắm cáy
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Mắm cáy is a type of fermented fish sauce made from the cáy, a small crab primarily found along the coastal regions of Vietnam. Mắm cáy has a reddish-brown color and a distinctive flavor, and it is a rustic dish from the Red River Delta.
Many northern localities in Vietnam are famous for this type of sauce, including Hải Phòng,[1] Hải Dương,[2][3] Quảng Ninh,[4] Thanh Hoá,[5] Thái Bình,[6][7] Hà Nam,[8] Phú Thọ[9]... is considered a unique feature of Vietnamese cuisine.[10]