To make this Old-Fashioned Buttermilk Pie gluten-free. Simply substitute the regular pastry crust. And all-purpose flour with gluten-free alternatives. You can find gluten-free pastry crusts. At most grocery stores. Or make your own. Using a mix of gluten-free flours. Like rice and almond flour. Also, replace the all-purpose flour in the filling. With a gluten-free flour blend. That includes xanthan gum. Which mimics the texture. And the elasticity of gluten. This swap allows you. To enjoy the same delicious, tangy, and creamy pie. Tailored to meet your gluten-free dietary needs.