Place the dried porcini mushrooms in a bowl or a Pyrex measuring cup, and pour on 2 cups boiling water. Let sit for 30 minutes. Set a strainer over a bowl and line it with cheesecloth. Lift the mushrooms from the water, and squeeze them over the strainer. Rinse in several changes of water, squeeze out the water and set aside. Pour the soaking water through the cheesecloth-lined strainer, and set aside. Heat the oil in a large, heavy soup pot or Dutch oven over medium heat. Add the onion, carrot and celery. Cook, stirring often, until just about tender, about five minutes. Add the sliced fresh mushrooms. Cook, stirring, until the mushrooms are beginning to soften, about three minutes. Add the garlic and a generous pinch of salt. Continue to cook for about five minutes until the mixture is juicy and fragrant. Add the reconstituted dried mushrooms, the wild rice, bouquet garni, mushroom soaking liquid, stock or water, and salt to taste. Bring to a boil, reduce the heat, cover and simmer one hour. Add the peas, and simmer another 10 minutes. Remove the bouquet garni, taste and adjust salt, add a generous amount of freshly ground pepper and serve.