Ingredients
Method
- Add the tomatoes with juices, onion, garlic, tomato paste, broth, salt, pepper, dried basil, and red pepper flakes to a 5 to 6 quart slow cooker. Stir to combine.
- Cover and cook on low for 8 hours or on high for 4 hours, until the onions are very soft.
- Turn off the slow cooker and blend the soup with an immersion blender until smooth. Taste and adjust salt.
- Stir in the heavy cream and butter, let warm through for 5 minutes, then ladle into bowls and top with fresh basil.
Notes
For a shorter cook, the soup works just as well on high for 4 hours. If you want to freeze, hold the cream and butter and add them after reheating. The soup will thicken slightly as it cools, so add a little broth when reheating if it's too thick for your liking.
