Italian Tomato-Basil Soup

Ingredients (7)

• 1 small red onion diced
• 0.33 cup fresh basil leaves thinly sliced
• 0.25 tsp salt
• 1 cup low-sodium vegetable broth
• 1 can no-salt-added tomato purée
• 2 tsp olive oil
• 2 tsp balsamic vinegar