Mtori

1. Simmer the beef in the water with half the onion and some salt for 40 minutes until tender.
2. Peel and chop the bananas, add to the pot with the rest of the onion and the tomatoes, and cook for 20 minutes until the bananas are soft.
3. Lift out the bones, then mash or blend the soup until smooth and creamy.
4. Stir in the butter, season and serve hot.

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