4 kg of bananas, 450 grams of raisins, 3 kg of sugar, 1 liter of strong tea, 1 dl of orange juilce and 1 dl of lemon juice. And of course yeast.
Peal the bananas and add them and the raisins to 5 liters of water, pour in the orange juice, lemon juice, the tea and boil for 30 minutes.
Separate the gunk with a strainer and pour the liquid into a fermentation bucket. Add more water and the suger until you hit 10 liter. Pitch the yeast. The one used in this recipe is a generic strong wine yeast.
No idea how it tastes though, I love bananas but I don't think they'd make a good wine. Although, it's kinda popular here in Sweden.