Sprinkle sugar and sesame seeds on a banana slice. Place a second banana slice on top of the sugar and sesame seed mixture. Repeat with remaining slices.
To assemble, place a filled banana on the lower third of the wrapper. Fold the portion of the wrapper nearest you over the filling until just covered. Turn the wrapper again to enclose the banana securely. Moisten the left and right hand edges of the wrapper with egg. Fold over the corners and press down firmly to seal, making an envelope. Moisten the flap of the envelope with egg and turn, rolling firmly into a cylinder. Seal firmly. Set aside, seam side down. Repeat with remaining slices.
Heat oil in a wok to 375 degrees F. Place 4 or 5 turon at a time in the hot oil. Fry until crisp and golden. Remove with a skimmer and drain on paper towels. Serve hot, sprinkled with powdered sugar.
I have never had this with sesame seeds. Must be an american version. Its always made with brown sugar also. If you dont have plaintains or brown sugar, try regular bananas and white sugar. Just be careful not to burn the banana, regular banana seem to burn easier. Also you should cook the plantain first by frying it then roll it brown sugar, wrap it and then fry so that the inside is well cooked and the outside very crispy. Also after wrapping the turon, freeze it and store it for another night.