Preheat the oven to 425F.
On a lightly floured surface, roll the pastry out slightly larger than your pie plate, and loosely fit it into the pan. Trim and crimp the edge however you like.
In a medium bowl (or the same one you used to make pastry), stir together the brown sugar, syrup, eggs, butter, vanilla and salt. Scatter a handful of currants, raisins and/or pecans over the bottom of the pie and pour the filling overtop.
Bake for 15 minutes, then reduce the heat to 350F and bake for another 40-45 minutes, until the pastry is deep golden and the filling wobbles evenly, and doesn’t look runny in the middle. Let cool completely (or almost) before slicing. Serves 8.