Mbriulata (Sicilian Sausage and Potato Pies)

I've been reading the Inspector Montalbano series by Andrea Camilleri, and so I am thinking about Sicilian food. I was looking for a recipe for cudduruni, and then came across a reference to mbriulata, so I decided to work up a recipe for them. Here is my version of these sausage and potato hand pies.