“…Since 2014, it has been China's National Geographic indication product. Its “natural” attributes mainly reflect in unique producing technology in the tofu-making process in which acidic whey replaced traditional calcium salt or acidulant coagulants, such as glucono-δ-lactone, as the coagulant ( Henao Ossa et al, 2022 , Wei et al, 2018 ). Acidic whey is usually made from tofu whey naturally fermented, a liquid by-product of the tofu-making process, which has been used as a coagulant in Mouding sufu with a long history ( Dai, et al, 2023 ).…”