Conversation so far:
What is tofu exactly?
Made from soybeans, tofu is also known as bean curd.
How is tofu made?
Tofu is made from soybeans that are ground in water, heated, and coagulated with minerals like calcium or magnesium salt. The curds are then pressed into a block, which is then sold as tofu.

Question: What are its origins?
Self-contained rewrite: What are tofus origins?