Dried Shiitake can be used in a variety of recipes. By using this method to reconstitute them, you can be sure that you are getting the best possible flavor. Rehydrating dried Shiitake at a low temperature will enhance their natural sweetness, and maximize the characteristics that give them their umami taste. Guanylate – the compound found in dried Shiitake that gives them their umami taste – also serves to enhance the umami of other ingredients. As a result, the entire dish will become even more delicious. Rehydrating them in a resealable zipper bag will give you the added convenience of fitting them in a small space in your fridge. Use a fairly large quantity of water, so that the Shiitake are completely submerged. You can add more water if needed later. If you have a lot of liquid leftovers, you can use it to make a broth for soup, etc. To prevent bitterness, strain the soaking liquid with a fine strainer, such as a tea strainer.