Mushrooms upon mushrooms upon mushrooms. These mushrooms are stuffed with a duxelles (a mixture of chopped wild mushrooms, onions, and herbs)—both fresh and dried.
Combine the dried porcini and boiling water in a small bowl, cover, and let stand until the mushrooms have softened, about 15 minutes. Drain through a coffee filter, reserving the liquid. Rinse the mushrooms under cool water to remove any grit and pat dry with paper towels. Finely chop by hand or in a food processor. Set aside.