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How to clean a portobello mushroom
Wet a folded paper towel with cool water.
Wring out the excess water so that the paper towel is just slightly damp. In most cases, a little bit of moisture is all you'll need to clean a freshly picked and packaged portobello.
Because of the size and anatomy of portobello mushrooms, they should be cleaned individually to ensure that the receive adequate attention. You can also use the soft side of a kitchen sponge.