First, make the pie crust. Combine the flour, sugar, and salt in a large bowl. Add the cubed butter and toss to coat. Dump the mixture out onto a clean surface and use a rolling pin to roll the butter into thin sheets, combining it with the flour. Use a bench scraper to scrape the rolling pin and to bring the mixture back into a pile as necessary. Continue until all of the butter is incorporated into the flour. Mixture will be very flaky. Return mixture to the bowl and place in the freezer for 15 minutes to chill the butter.

Remove from freezer and add the buttermilk. Use a spoon and then your hands to stir the mixture until it comes together into a ball. If mixture is too dry, add the water a tablespoon at a time. Divide the dough in two and flatten into disks. Wrap each disk in plastic wrap and chill in the fridge while you make the filling.

Put the apple slices in a large bowl and drizzle with fresh lemon juice. Toss to coat the apples. This will keep the apples from browning. Add the cranberries, sugar, flour, cinnamon, orange zest, and vanilla extract. Stir until combined.