If sausage is in casing remove. Cook on medium 8 minutes or until done in a dutch oven. Remove. Cook mushrooms, shallots, carrots and celery in same pot on medium-high for 10 minutes. Add the barley, garlic and thyme and cook 2 more minutes. Stir in broth and 3 cups water. Bring to boil. Reduce heat to low, cover and simmer for 10 minutes. Stir in spinach and sausage and cook for 2 more minutes.