Three Trees Pie

Putting the "tart" in tart

While citrus can’t survive our winters here in the northeastern US, we’re lucky to have some pretty wonderful substitutes that grow all over the place. This little tart uses two of them, both of which grow on trees—spruce tips and sumac bobs—plus maple syrup from a third tree, hence the name. I’m not going to tell you that this tastes exactly like key l…