Step 1

Place the garlic, broth, tomato paste, diced tomatoes, onion, and lemon juice into a 4-quart slow cooker. Stir. Cover and cook on low for 8 hours.

Step 2

Add the olive oil. Use an immersion blender or blend the soup in batches in a standard blender until smooth.

Step 3

Garnish with bell peppers and basil before serving.