Directions:

For the Butternut Squash Purée: Adjust oven rack to lower-middle position and preheat to 400°F (205°C). Split the squash lengthways, remove seeds, and place cut-side down on a foil lined aluminum baking sheet. Roast until fork-tender, about 45 minutes. When cool enough to handle, scrape pulp into a food processor and purée until smooth. Measure out 14 ounces (about 1 3/4 cups; 395g) squash purée. Use warm, or refrigerate in an airtight container up to a week in advance.

For the Custard: Adjust oven rack to lower-middle position and preheat to 375°F (190°C). In a medium bowl, combine butternut squash purée, homemade condensed milk, brown sugar, vanilla or bourbon, ginger, cinnamon, nutmeg, salt, cloves, butter, and eggs. Whisk until well combined, then pour into the prepared crust. Alternatively, the prepared custard can be refrigerated for up to a week before use.

To Bake: Place on a half sheet pan and bake about 25 minutes, then reduce oven temperature to 350°F (175°C) and continue baking until the filling is firm around the edges but still wobbly in the very center, about 25 minutes more, or to an internal temperature of 200°F (93°C).
Cool at room temperature until the custard has set, about 2 hours, and cut with a chef's knife to serve. If you like, serve with a dollop of whipped cream and a sprinkling of grated nutmeg. Wrapped in plastic, leftovers will keep 4 days at room temperature, or 10 days in the fridge.

For the Dough: Whisk flour, sugar, and salt together in a medium bowl. Cut butter into cubes no smaller than 1/2-inch, and toss with flour mixture to break up the pieces. With your fingertips, smash each cube flat—that's it! No rubbing or cutting. Stir in water, then knead dough against the sides of the bowl until it comes together in a shaggy ball. Dough temperature should register between 65 and 70°F (18 and 21°C); if not, refrigerate briefly before rolling and folding (see note).

Make the Layers: On a generously floured work surface, roll dough into a roughly 10- by 15-inch rectangle. Fold the 10-inch sides to the center, then close the newly formed packet like a book. Fold in half once more, bringing the short sides together to create a thick block. Divide in half with a sharp knife or bench scraper. Dough temperature should still be somewhere between 65 and 70°F (18 and 21°C); if not, refrigerate briefly before proceeding

For Single-Crusted Pies: Using as much flour as needed, roll one piece into a 14-inch circle; this size allows ample room to line the pie plate, with enough overhang to form a generous border. At smaller sizes, the dough will fall short, making it difficult to shape the edges, and the thicker dough will not crisp as intended. Transfer to a 9-inch pie plate; the dough should be easy to handle, and will not require any special procedures to move. Dust off excess flour with a pastry brush, using it to nestle dough into the very corners of the pan. With scissors or kitchen shears, trim the edge so that it overhangs by 1 1/4 inches all around. Fold overhang over itself to create a thick border that sits on the top edge of the pie plate, not below. Crimp or shape crust as desired. Repeat with remaining dough. Wrap with plastic and refrigerate at least 2 hours and up to overnight. Use as directed in your favorite recipe.

For a Blind-Baked Pie: Adjust oven rack to lower-middle position and preheat to 350°F (180°C). Line pie shell that has been chilled for at least 2 hours (as outlined in Step 3) with a large sheet of aluminum foil, pressing so it conforms to the curves of the plate (a second sheet of aluminum may be needed for full coverage). Fill to the brim with sugar, transfer to a half sheet pan, and bake until fully set and golden around the edges, 60 to 75 minutes. Fold long sides of foil toward the middle, gather short sides, and use both hands to carefully transfer sugar to a heat-safe bowl. Let sugar cool to room temperature. If needed, continue baking crust a few minutes more to brown along the bottom.