Family Tested & Approved
Preheat oven to 350 degrees F.
Mix sugar and flour together. Beat eggs well and add to dry mix. Mix on medium speed for 2 minutes.
Add butter and buttermilk and mix on high for 2 minutes. Add lemon juice and vanilla extract.
Pour mixture into unbaked pie crust. Bake until golden, 55 minutes to 1 hour. Pie will look jiggly when removed. But, will firm as it cools.