Unroll the puff pastry. Mash the feta cheese with a fork. Add egg, herbs, possibly salt and pepper (attention, the cheese is already salty!) And mix everything well.
Spread on the dough sheet, leaving a piece lengthways free to roll up. Brush the free piece with water and roll it up from the filling side. Press the seam well with a fork.
Cut the roll into 12 snails, sprinkle with sesm cheese and bake at 200 ° C (top / bottom heat) in the preheated oven for about 25 minutes.