Let cool for at least 10 minutes. Meanwhile, make the fruit filling: In a large mixing bowl, whisk together the sugar, flour, and salt. Add the eggs and sour cream and whisk until smooth.
Add the zest and cherry ... the top of the pie. Pinch the puff pastry in at the sides so it is attached to the base. Bake for 40 minutes, until the pastry is golden and the filling is bubbling ...