Peel and grate the pumpkin coarsely. Heat 2/3 of the oil in a pan over medium heat and pour in all the grated pumpkins. Stew for about 10 minutes, stirring regularly with a kitchen turner, until the pumpkin starts to soften.
Put the prepared pumpkin into a bowl and add the remaining ingredients for the filling - walnuts, sugar, raisins and cinnamon. Mix gently until well combined.
Preheat the oven to 356°F. Line a baking tray with baking paper or brush it with a little oil. Then, take a sheet of dough and lay it out on a clean work surface with the wider side facing you.
Brush some oil onto the sheet using the basting brush, then spread the filling all over it. Lift the edge of the sheet closest to you and roll/fold it.
Roll up the sheet. If it is too long, cut it in half and then put the two pieces in the baking tray. Repeat the previous steps with the remaining dough sheets.
Before you put the Tikveniks in the oven, you must first grease them with oil. For more flavor, you can add some cinnamon to the oil.
Once done, transfer the baking tray to the oven and bake at 356°F for 40-45 minutes or until golden brown.
When the Tikveniks are ready, remove them from the oven. Let the Tikveniks cool for about 10 minutes before slicing.
When serving, you can sprinkle a little powdered sugar on top.