Roll out a very thin dough. I have a silicone mat, but you can use a towel, sprinkle it well with flour (if the dough is rolled out just on the table, then it will be very difficult to fold the strudel and put it on a baking sheet). With softened butter (about 20-30 g), lubricate the dough layer, except for about 10 cm from one edge (this will be a seam).