Constance Methvin, also of Baltimore, shared her recipe for making sweet potato pie. She used to bake the pie for Bertha's Restaurant and Bar in Fells Point and they were very popular. She made her pies with the flesh from freshly baked sweet potatoes and then used a basic pumpkin pie recipe using the sweet potato puree in place of the pumpkin and tweaking the spices just a bit. She said it's possible to cheat a little and use canned sweet potatoes for convenience; if the spices are done right it will be hard to notice the difference in the finished pie. If you have the time, I would recommend you bake the sweet potatoes — it's easy enough and I think it tastes better.