Melt the butter and brush the surface of the puff rectangle.
Coarsely grate the provolone and distribute it evenly on the sheet.
Sprinkle with the fennel seeds and a spoonful of grated orange peel. Salt and pepper.
Fold the two longer sides inwards, so that the outer edges touch each other, brush again with melted butter, and then fold one flap on the other so as to obtain a long strip of filled puff pastry.
With a sharp knife, slice the pastry into 1cm thick pieces, and arrange them with the cut side down on a baking sheet covered with parchment paper. Bake at 180 ° C and cook for about 20 minutes or until the fans are lightly browned.