Mushroom Stock

Name: Mushroom Stock
Ingredients: 3 tablespoons olive oil; 4 ounces shiitake mushrooms, cleaned and cut into quarters; 8 ounces cremini mushrooms, cleaned and cut into quarters; ,50 ounces dried porcini mushrooms, soak in 1 cup of warm water for 20 minutes; 1 yellow onion, skin removed, cut into quarters; 1 large celery stalk, cut into pieces; 1 large carrot, cut into pieces; 3/4 tablespoon tomato paste; 1 tablespoon white miso; 1 bay leave; 6 sprigs fresh thyme; 7 cups water