Make the dough: mix together the flour & salt and then pour in warm water, vinegar, and oil. Knead the dough with hands until it's smooth-it should be smooth & elastic, not too soft & sticky. Brush the dough with oil and cover and place in a warm spot for 30 minutes.
Take a clean tablecloth and dust with some flour. Roll out the dough with a rolling pin until thin and then begin stretching it with your palms and tip of your fingers.
Stretch it from the middle until you make it very thin, almost that you can see through it. Cut out thick edges.
Sprinkle the dough with melted butter. Put the filling over the one side of the dough. Roll it, using the tablecloth.
Using your hands, separate the dough into equal parts and cut them with a plate. Cutting with a plate is a great way to firmly seal the edges and ensure the filling doesn't pour out.