sfogliatelle

What is the roll of lard or butter in a pastery dough with the dough gets stretched out paper thin like strudel? 

I am trying to make a similar dough for an Italian pastery that has to be streched literally paper thin.  I am using breadflour for a higher gluten content.  I undersand this is not typical for flaky pastery,  however, since its being streched so thin you need good gluten development.