Porcini Mushrooms Dried - Extra Grade 'A' - 1 lb/454 gr. Ingredients: Porcini mushrooms (Boletus Edulis). Use: Preserve dried mushrooms in an airy bag in a dry room. Instructions: Soak in lukewarm water for 15 minutes. Drain, then dip in boiling water for another 10 minutes. Place in colander and rinse thoroughly. 16 oz of dried mushrooms equals 160 oz of fresh wild mushrooms.