• You want to you buy organic mushrooms. Why? Because to wash a mushroom is to ruin it. Mushrooms are sponges, they will taste like whatever you cook them with. So if you run them under water to wash them, they will absorb some water and be rather rubbery and tasteless. If you must wash them, take a dry paper towel and dust off the dirt.
• When browning mushrooms,  do not use salted butter or add any salt until after they have browned.  For more tips click here.