Slow-Cooker Bean and Barley Soup

Ingredients

• 1 cup dried multibean mix or Great Northern beans, picked over and rinsed
• 6 cups water
• 1 (14-ounce) can whole tomatoes, with juice
• 3 cloves garlic, smashed
• 2 ribs celery, chopped
• 2 medium carrots, chopped
• 1/2 medium onion, chopped
• 1/2 cup pearl barley
• 1 bay leaf
• 1 1/2 tablespoons kosher salt, plus additional for seasoning
• 2 teaspoons dried Italian herb blend
• Freshly ground black pepper
• 1/2 ounce dried porcini mushrooms, optional
• 3 cups cleaned baby spinach leaves (about 3 ounces)
• 1 cup freshly grated Parmesan
• 1 tablespoon balsamic vinegar
• Extra-virgin olive oil

Directions

Put beans, water, tomatoes and their juices, garlic, celery, carrots, onion, barley, bay leaf, 1 1/2 tablespoons salt, herb blend, pepper, and porcini mushrooms (if using) in a slow cooker; cover and cook on LOW until the beans are quite tender and the soup is thick, about 8 hours.

Stir in the spinach, cheese, and vinegar, cover, and let the soup cook until the spinach wilts, about 5 minutes. Taste and season with salt and black pepper, to taste.

Ladle the soup into warmed bowls and drizzle each serving with olive oil.