Gypsum is a coagulant agent for tofu. It has a similar texture to cornstarch but is light grey in color. Make sure the one you choose is marked food-grade and is labeled calcium sulfate dihydrate (not simply calcium sulfate). We prefer the Pure Supplements brand, which can be found online. We tested the recipe using store-bought unsweetened soy milk. If you want to make this recipe using homemade soy milk, use only 1 teaspoon gypsum in the recipe instead of 1 1/2 teaspoons.
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