Healthy Homemade Lentil Soup Recipe

Ingredients

• 1 tablespoon olive oil
• 1 medium celery stalk, small dice
• 1 medium carrot, peeled and small dice
• 1/2 medium yellow onion, small dice
• 3 medium garlic cloves, minced
• Kosher salt
• Freshly ground black pepper
• 1 quart low-sodium vegetable broth
• 1 (15-ounce) can diced tomatoes with their juices
• 1 1/4 cups lentils (any color except red), rinsed
• 3 medium potatoes cut in chunks
• 1 bay leaf
• 1/4 teaspoon finely chopped fresh thyme leaves
• 1 teaspoon red wine vinegar or sherry vinegar
• 2 ounces spinach leaves (about 1/2 a bunch)