Carefully peel the mushrooms, discarding the skin. Slice the shiitake horizontally across the mushrooms, from the top, making the slices as thin as possible. Leave behind the gills. Dehydrate the slices in a 100°C (200°F/Gas ½) oven for 2–3 hours or until completely dry.
Process the dried mushroom flesh in a spice grinder to a fine powder and store it in an airtight container until required.
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