Add the remaining oil to the Dutch oven. Add the onion, garlic, carrots, and mushrooms and cook until the vegetables are soft, about 5 minutes. Stir in the tomato paste and thyme and cook until fragrant, about 30 seconds. Add the broths, reserved porcini liquid and barley, and bring to a boil. Cover and cook over medium until barley is tender, about 12-15 minutes. Uncover the pot and bring to a boil. In a small bowl, whisk together the cornstarch and remaining tablespoon of broth. Add the mixture to the soup and cook until slightly thickened, about 1 minute. Remove from the heat. Add the beef and any accumulated juices. Stir in the Worcestershire, vinegar, and parsley. Season to taste with kosher salt and freshly ground black pepper. Enjoy!