You can dry mushrooms and they are a useful addition to the store cupboard. To dry your own, place the mushrooms on racks in a very low oven for several hours or overnight. Large, fleshy flat mushrooms can be sliced before drying. The dried mushrooms are ready for storage when they are dry but still just pliable rather than crisp. If stored in airtight containers, the dried mushrooms can be kept and used for up to 12 months.
** Asian Recipes