Hi chefs! Yesterday i made choux and i filled them with amaretto pastry cream lightened with wipped cream. It was nice. But there is a problem. Whenever i make lightened pastry cream it turns out grainy after it has been stored in the refrigerator for some hours. The same happened when i made a tart with lightened pastry cream and strawberries. The next day it was full of grains. However i never have problem with simple pastry cream. Thanks a lot!