Pistachio paste: I use storebought pistachio paste (also known as pistachio spread) such as Pistakio or Pisti brands for the filling to save time. You can definitely swap in homemade pistachio paste or pistachio cream if you prefer! Yeast: I use active dry yeast in this recipe, but you can use either instant or active dry yeast. If the active dry yeast doesn't activate and get foamy, discard it and start over. If you're using instant yeast, then you don't need to heat the milk or add the ye...