I have never made a vinegar pie, but make buttermilk pie often. We love it. I found the recipe in an Amish cookbook. 1 -9" unbaked pie shell. 1/2 cup softened butter, 1 1/2 cups sugar,3 tbsp flour, 3 eggs, 1 cup buttermilk, 1 tsp lemon juice, 1 tsp vanilla, pinch of salt, grated nutmeg.
Preheat oven to 350. Place softened butter and sugar in mixer and cream well. Add flour eggs, buttermilk, lemon, vanilla and salt. Mix well. Pour into pie shell and top with a little bit of grated nutmeg. Bake for 1 hour until top it lightly browned.