Cooking is my Waterloo so I asked the help of my sister, Joy. Here she demonstrated how to salt the tofu squares. She used about a heaping tablespoon of rock salt and rubbed it on all exposed surface of the tofu. Do this for the rest of the squares. Arrange the tofu squares in a container, cover with a lid, and let sit for a day. You can keep it in the refrigerator or leave outside, not a problem.