Melt the butter in a medium-size cast iron or nonstick pan over medium heat. Add the apples, sugar, and salt. Cook, stirring, until apples are tender and the sugar is melted and gooey,
Stir in, cinnamon, cardamom, and breadcrumbs. Remove from heat and let cool.
Gently remove 6 fillo sheets from the package and keep them covered under a kitchen towel. They dry out pretty quickly, so it is important to keep them covered.
Place three sheets on the clean working surface. Cut the layered sheets into half lengthwise, then each half into thirds. You want to get a total of 6 equal squares (trim the sheets if necessary).
Place a heaping tablespoon of the apple filling in the middle of a fillo square (best if you turn the square so it looks diamond-shaped). Fold up bottom half and tightly fold in sides. Gently roll, then seal fold with a couple drops of water. Repeat with remaining apple mixture. (See GIF in the post)
In a large skillet over medium heat, heat the oil (it should reach 1" up the side of the pan). Add the rolls and fry until golden, about one minute per side (do in batches). Transfer to a paper towel-lined plate to cool slightly.
Dust apple rolls with powdered sugar and serve with caramel sauce.
~ Free Tip ~
If you're not using Fillo Factory fillo, you might need to adjust the number of sheets needed for this recipe as sizes and thickness of the sheets differ from brand to brand. I.e. if fillo is extra thin, add an extra sheet to the layers. If the sheets are on a smaller size, cut into 4 squares and add another stack.
There is no need to brush the layers of fillo with oil or butter as they are fried. If you wish to bake them instead, then you'll need to brush each layer and then the tops of the rolls. Bake on 350 degrees Fahrenheit preheated oven for about 20-30 minutes or until golden brown in color.