In a large bowl, whisk together the sweet potato puree, evaporated milk, and eggs until smooth.
Add the sugar, vanilla extract, cinnamon, nutmeg, ginger, and salt to the mixture. Whisk until all ingredients are fully combined and the filling is smooth.
Pour the sweet potato filling into the unbaked pie crust.
Bake for 50 to 60 minutes, or until a knife inserted near the center comes out clean.
Let the pie cool completely on a wire rack before slicing and serving.
Notes
For the best texture, bake whole sweet potatoes until very soft, then scoop out the flesh and mash it well before measuring.
You can substitute pumpkin pie spice for the individual spices if you prefer.
Chilling the pie for several hours before serving helps the filling set firmly.