In a saucepan with high walls (swell the caramel with condensed milk) put the sugar with water and let it boil and caramelize. The color of the caramel should be medium (not very blond but not very dark - it becomes bitter). Remove the pan from the heat and add 1/3 of the condensed milk (no more because it swells and bubbles very much!). Mix carefully (do not sprinkle) and when it calms down, add the rest of the condensed milk.
Put the pan on low heat again and mix in it for 4-5 minutes, being careful not to let it out. During this time the sauce will decrease and become more bound. At the end, turn off the heat and add vanilla (vanilla sugar or vanilla bean core) and sprinkle a little sea salt.
Since the condensed milk I had was quite weak I had to add a little butter to the hot sauce. Stir gently and set aside.
Peel a banana, grate it and cut it into 3 cylindrical pieces.
The pie sheets are portioned in rectangles of about 20 x 25 cm. The easiest way is to cut 2 rectangles of paper with these dimensions and try to fit them as well as possible on the surface of the sheets, with minimal losses. I put all 12 sheets on top of each other and I drew with a light knife the contours of the 2 rectangles and then I cut with scissors the necessary pieces, all at once. There will be edges that will be used as well. Each roll is composed of 3 layers of dough: the outer and inner ones are whole, beautiful rectangles, and the middle one can be fine from "falls". Take a nice rectangle and grease it with a little melted butter. A layer of "falls" is placed over it, which is also greased a little and ends with another beautiful rectangle. Place 1/2 banana and a square of chocolate on it and roll like cabbage rolls.
The result is 12 rolls that are greased on the outside with the rest of the melted butter and placed on baking paper in a tray.
Bake the rolls for 30 minutes until golden and crispy (at 200C, high stage in gas ovens).
I'm ready! Mine were shared: some wanted with / others without caramel sauce. The chocolate inside enveloped the soft and fragrant bananas. They are very good and so on!
But the version with the caramel sauce dripped on top (accompanied by crispy nuts) was a dream! The caramel salt balanced the whole composition together with the dark chocolate