Sonker is a locally regional form of pie. The county north of us claims to have devised it, however what they call Sonker I have always called a cobbler. In my area a sonker is a deep-dish layered pie. Works very well with sweet potatoes, blackberries, or other fruits. I put a layer of pie crust on the bottom of a deep baking dish, then sweet potatoes, spices and plenty of butter, another layer of crust cut into strips, more potatoes, spices, and butter, and another layer of crust. When I prepare my potatoes I first peel, then steam them until they are 3/4 done. I then slice them, once the pie is assembled I pour the water from steaming over the pie until it is just even with the top of the layers. It is then baked until done. If done correctly, it cannot be beat. A big scoop of sonker with some vanilla ice cream on top is right next to heaven.
The county north of us has an annual Sonker Festival. I have never been, usually I hear about it from a newspaper article after it is over.