Silken tofu Scramble - Silken Tofu Most recipes will let you know when silken tofu is needed. I find that there is little difference between firm and extra firm silken tofu, and for most purposes, the different kinds of silken tofu are interchangeable, so don’t worry if your grocer only stocks one kind. Salad dressings, sauces and desserts usually use silken tofu for a thick and creamy texture. Silken tofu in an aseptic container has a shelf life of up to a year, unopened. Once opened, submerge any used portion with water in a container, cover, and refrigerate for up to a week. http://vegetarian.about.com/od/vegetarianvegan101/f/TypesofTofu.htm