Mushroom Powder

• 5 shiitake mushrooms (1 ounce), stems removed

Using a very sharp knife, cut the shiitake mushrooms into paper-thin slices. Line a microwave tray with a piece of parchment paper and lay the mushroom slices on it in a single layer. Microwave on medium power for about 10 minutes, or until the mushrooms look shriveled and about half of their original size. If the mushrooms are not crisp, return to the microwave briefly; they should be fully dr