Peel and slice the bananas in half lengthwise, and then into thin 1 cm. slices. Cut the jackfruit into thin strips about ½ cm. in thickness.
In a small bowl, combine the palm sugar, cinnamon, ground cloves, and salt. Then, toss the fruit in the spiced sugar mixture.
Working one at a time, using spring roll papers that have thawed enough to be soft to the touch, lay a spring roll wrapper on a clean surface with one edge facing towards you.
Place roughly a 3-tablespoon portion of filling into the center of the bottom edge of the spring roll wrapper.
Fold the edge closest to you over the filling, then fold in the sides, and roll up tightly like a little baby burrito. Seal the edge with a mixture of water and cornstarch to ensure it stays closed. Repeat with the remaining wrappers and filling.
Heat oil in a deep pan or pot over medium-high heat until it reaches 350°F (175°C). Fry the turon in batches until golden brown and crispy, about 2-3 minutes per side. Use a slotted spoon to transfer them to a wire rack suspended over a baking pan to drain excess oil.
For air-frying: preheat the air fryer to 375°F (190°C). Arrange the turon in a single layer in the air fryer basket, ensuring they do not touch. Air-fry for 10-12 minutes, turning halfway through, until they are golden and crispy.
To make the caramel: in a dry, medium-sized stainless steel saucepan, cook the sugar over medium heat, stirring with a dry metal spoon occasionally, for 3-4 minutes until the sugar melts. Turn off the heat and whisk in lemongrass powder, nutmeg cardamom and coconut cream until smooth.
Using a pastry brush, brush the hot caramel on both sides of the crisp, warm turon, and allow them to cool and set for 6-7 minutes before serving, so no one scorches their whole face off!