Puff pastry
Light, flaky pastry
Puff pastry, also known as pâte feuilletée, is a light, flaky pastry, its base dough (détrempe) composed of wheat flour and water. Butter or other solid fat (beurrage) is then layered into the dough. The dough is repeatedly rolled and folded, rested, re-rolled and folded, encasing solid butter between each resulting layer.
From Wikipedia, under CC BY-SA. More on occurri.