Mushroom Medley in Parchment with Rosemary and Gremolata

Name: Mushroom Medley in Parchment with Rosemary and Gremolata
Ingredients: 1 oz. dried porcini mushrooms; 1 cup lightly packed coarsely chopped fresh parsley leaves; 2 large lemons, 1 grated to yield 1 Tbs. zest and squeezed to yield 3 Tbs. juice, the other thinly sliced; 5 medium cloves garlic; Kosher salt; ¼ cup olive oil; 2¼ lb. mixed mushrooms, such as cremini, maitake, shiitake, white button, and oyster, cleaned, trimmed, and quartered (about 4 cups); 2 sprigs fresh rosemary, lightly crushed; Freshly ground black pepper