The primary ingredient used to make tofu is soybeans. Tofu, a staple in many Asian cuisines, is created by coagulating soy milk and pressing the resulting curds into solid white blocks. The process of making tofu involves soaking soybeans, grinding them with water, boiling the mixture, and then straining it to create soy milk. Coagulants, such as magnesium chloride or calcium sulfate, are added to curdle the soy milk. Tofu is valued for its high protein content, versatility in cooking, and ability to absorb flavors, making it popular among vegetarians and vegans.