1 1/2 Margarine
Preheat oven to 400°F.
Beat the butter and sugar together until light.
Add the eggs and beat; then beat in vanilla.
Sift the dry ingredients together and add to the batter alternatively with the buttermilk; beat until smooth.
Pour into a deep dish pie shell and bake at 400F for 10 minutes, reduce heat to 350F and bake for 50-60 additional minutes.
Pie should turn a nice golden brown and a knife inserted should come out clean.
I think it is absolutely best when it is just still warm. (Not too hot, or it will be like napalm..