Mushroom and Barley Soup recipes

Name: Mushroom and Barley Soup recipes
Ingredients: 1 cup (1 ounce) dried porcini mushrooms; 3 cups boiling water; 4 tablespoons olive oil, divided; 4 cups mixed mushrooms (such as shiitake, maitake, oyster and beech), roughly torn; 1 tablespoon thyme leaves; 2 celery stalks, finely chopped; 2 garlic cloves, minced; 1 medium yellow onion, finely chopped; 1 carrot, peeled and finely chopped; 1 tablespoon flour; 7 cups vegetable stock; 1 cup pearl barley; 2 tablespoons finely chopped parsley, plus more for garnish; 1 tablespoon red wine vinegar; kosher salt; freshly ground black pepper