Lentil and Spinach stew

Ingredients

• 1 cup dry lentils
• 1 medium onion -- chopped (1/2 cup)
• 2 cloves garlic -- minced
• 1 tablespoon broth or water -- (more if needed)
• 4 cups water
• 1 can tomatoes -- cut up (7-1/2 oz.)
• 4 teaspoons instant vegetable bouillon granules
• 1 tablespoon vegetarian Worcestershire sauce
• 1/2 teaspoon salt
• 1/2 teaspoon dried thyme -- crushed
• 1/4 teaspoon fennel seed -- crushed
• 1/4 teaspoon pepper
• 1 bay leaf
• 2 medium carrots -- chopped (1 cup)
• 1 package frozen chopped spinach -- (10 oz.)
• 1 tablespoon balsamic vinegar -- or red wine vinegar