Lithuanian Apple Cookies

First prepare the apples. In a medium bowl mix the apple slices, sugar and some cinnamon, enough to cover the apples. Set aside while you prepare the dough.
Preheat the oven to 200u0b0C (about 400u0b0F). Line a baking sheet with Silpat or parchment.
To prepare the dough, in a food processor pulse flour, sugar and salt to combine. Add cubed butter, cheese and sour cream and pulse until all ingredients come together and form a ball.
Take the dough out of the food processor and place it onto a floured surface. If it looks like it is too sticky to roll with the rolling pin, add a small amount of flour and knead with your hands until it looks like it can be rolled with the rolling pin.
When the dough is ready, cut about a quarter of the dough and roll it into a long narrow rectangle. Then cut it into long strips about 2 cm wide. Take one strip and wrap it around the apple slices in an overlapping manner, covering all of the apple slice with the strip. If the strip is too short, add a piece of another strip. Pinch the ends of the cookie so that there are no holes.
Dip one side of the cookie into the egg white, then into the sugar, and place it on the baking sheet, sugary side facing up. Continue with the rest of the cookies. Bake until the cookies are deep golden brown, about 25 minutes. Don't try to eat them straight from the oven; let them cool a bit before serving because the apple inside will be very, very hot.