Steps
1. Melt 6 tbsp margarine in saucepan. Add onion; cook until tender.
2. Stir in flour and seasonings. Gradually stir in bouillon and milk.
3. Cook over medium heat, stirring constantly, until mixture thickens and comes to a boil. Add tuna and lemon juice; heat to serving temperature.
4. Meanwhile, peel bananas annd melt remaining 2 tbsp margarine. Cut bananas in half lengthwise and place on broiler rack. Brush with melted margarine annd broil 2 mn, until just tender.
5. Serve curried tuna over boiled bananas. Serve hot.

Source
Compa?ia Bananera de Costa Rica, STARGARDTER, F. (ED), All you need is under the peel - green bananas recipes, Golfito