Prosciutto-wrapped pork loin with roasted apples
Ingredients: 1 oz. (1 cup) dried whole porcini mushrooms, 2 oz. (3/4 cup) dried apples, 1 lb. kale, bottom stems trimmed, 2 teaspoons kosher salt plus more, 2 tablespoons (1/4 stick) unsalted butter, 1 cup minced onion