Mushroom Barley Soup

Name: Mushroom Barley Soup
Ingredients: 1/2 ounce dried Polish mushrooms or dried porcini mushrooms*; 6 tablespoons unsalted butter; 1 medium onion, diced; 3 cloves garlic, minced; 3/4 pound fresh mushrooms, trimmed and thinly sliced; 2 stalks celery with leaves, diced; 1 large carrot, peeled and diced; 1/4 cup chopped fresh parsley; 1 tablespoon all-purpose flour; 1 quart low-sodium beef broth; 3/4 cup barley, rinsed; 2 teaspoons kosher salt; Freshly ground black pepper; *Using a blend of fresh mushrooms is also nice. Try shiitake, cremini, or button.