Preheat the oven to 350ºf
Divide the dough into 10 balls, dust the balls in flour and set aside.
On a floured surface, roll each ball out into a circle with pastry about 1/4" thick. Use a plate or bowl to trim into a neat circle if needed. That will help keep all the pasty's the same size.
Place about 3 heaped tablespoons of the mixture on one side of a circle, keeping the mixture away from the edge. Wet the edge of the circle with a little water, then fold the empty side over the filling and crimp the edges well with a fork or crimp in a traditional pasty style with forefinger and thumb. Be sure edges and corners are well sealed to avoid leaks when cooking.
Transfer the pasty's to large baling sheets and with a paring knife cut several large slits to allow steam to escape. Where the slits come together open up a small hole.
Melt a stick of butter in the microwave and pour about a tablespoon of butter into the hole in top of the pasty. Brush the pasty's with a little milk and bake for one hour, until nicely golden. Remove and set aside to cool.
I suggest serving with Raita, an Indian yogurt mint dip