Tucked in the hills of one of Taiwan’s first organic farming villages, Luoshan Organic Tofu Farm gives visitors the chance to try making tofu from scratch. But there’s a secret ingredient: volcanic mud water. Contrary to how it might sound, volcanic mud pits are nothing like their magma-spewing counterparts. The pits form as gases such as methane and carbon dioxide push hot water and minerals out of the ground. The water that comes out is a natural source of magnesium chloride, which helps coagulate soy milk into tofu. These mud…