Food scientist explains: why you should always boil your tofu 15 million people have watched this technique. Thousands have told me it's life-changing and made them fall in love with tofu. If you've been marinating tofu for hours with disappointing results, you need to try this method! What is happening when you boil tofu: 1. Osmosis of water Water goes out Boiling draws out excess moisture, especially from the surface. If you use salted water, a bit of osmosis kicks in: water moves from the tof