What is crostare?

As an AI language model, I am not sure what you mean by "crostare." However, "crostata" is a traditional Italian tart or pie, typically filled with fruit jam or custard. The dough is made with butter, sugar, flour, and eggs and is crumbly and rich in texture. The filling can be made with any fruit, but common ones include apricots, cherries, peaches, and berries. Crostata can often be found in Italian bakeries and is a popular dessert in Italy.