Dough for a 8 or 9 inch one crust pie (I'm going to assume that everyone here knows how to make a pie crust. If not, we can get into it in the comments. I use my favorite one from my 1962 Betty Crocker cookbook.)
1 cup sugar
3 T. flour
3 eggs, well beaten
1/2 cup (one stick) butter, melted
1 cup buttermilk
3 T. lemon juice
Grated zest of one lemon (optional, I didn't have it)
Preheat the over to 425F
Line a 8 or 9 inch pie pan with the rolled out dough, prick all over with a fork, and press a piece of heavy foil into the shell. Bake for 6 minutes, remove foil and bake another 4, until the edges start to color.
Combine the flour and sugar in a bowl, and stir to mix. Add the eggs, butter, buttermilk, lemon juice, and zest, mixing well. Pour filling into the prepared pie shell and bake ten minutes. Lower the heat to 350F and back another 30. It should be puffy and almost set.
Let cool a bit but don't chill, it's good warm.
x-posted to icanhazrecipes