Prepare a classic croissant dough with the dough and the croissant butter. Give 3 single tours (3 x 3).
Leave in the fridge during 1 hour, minimum.
Stretch out the dough at 5 mm and 50 cm width.
Spread out the pesto on the laminated dough and sprinkle the grated mozzarella chees on top of it.
Roll both sides to the middle, in a form like glasses.
Cut pieces of 2 cm and place them on a baking tin, or store covered in the freezer.