Prepare the Filling:
Slice the bananas in half lengthwise. If using canned jackfruit, drain well and slice into thin strips.
Assemble the Turon:
Lay one spring roll wrapper flat on a clean surface. Place a banana half and a strip of jackfruit diagonally near one corner of the wrapper. Fold the bottom over the filling, then fold the sides inward, and roll tightly. Seal the edge with water or beaten egg. Repeat with the remaining ingredients.
Caramelize the Sugar:
Heat the vegetable oil in a large frying pan over medium heat. Sprinkle granulated sugar evenly over the oil. Let the sugar melt and begin to caramelize.
Fry the Turon:
Once the sugar is caramelized, carefully add the wrapped Turon to the pan. Fry in batches to avoid overcrowding. Cook for 2–3 minutes per side, or until the wrappers are golden brown and crispy, and the sugar coats them.
Drain and Cool:
Remove the Turon from the pan using tongs or a slotted spoon, and place them on a plate lined with paper towels to drain excess oil.