If you live in Texas, you may have been to Round Top, the giant antiques fair is held here twice a year. If you visit, you have to stop in at Royer's and have a slice of this heavenly buttermilk pie. If you are not lucky enough to live close by, then you are going to have to make this delicacy.Plan Ahead Note: the pie crust needs to be refrigerated for one hour before rolling. The butter and eggs for the pie batter need to be at room temperature.
To make the crust: put the flour, salt, and sugar in a food processor. Pulse a few times to mix.
Add the butter pieces and process for about 10 seconds, until the mixture is the consistency of coarse meal.
With the food processor running. slowly add the ice water in a thin stream just until the dough holds together. Do not process the dough for more than half a minute.
Turn the dough out, roll it into a ball, and wrap it securely in plastic wrap. Refrigerate 1 hour before rolling out. Set aside.
Pie
To make the pie: Preheat the oven to 300°.
In the bowl of a stand mixer fitted with the paddle attachment, beat together the butter and sugar on medium speed until fluffy.
Add the eggs and flour and stir on low until well blended.
Add the buttermilk, vanilla, and nutmeg and combine well.
Pour into the unbaked pie shell. Bake for 1 ½-2 hours or until a toothpick inserted into the center comes out clean. Let cool completely on a wire rack and refrigerate before serving.