Peel bananas, mash into puree. Peel the apples, grind the pulp into a puree, squeeze the lemon juice (leave a little lemon juice to extinguish the soda). Mix.
Quench the soda with the remaining lemon juice. Add to the fruit mixture, add sugar, flour, vegetable oil. Mix well.
Add toppings as desired: nuts, dried fruits, apples, pears. I added pineapple.
Put in the oven to bake until brown. When serving for decoration, you can sprinkle with mint leaves.