Ingredients
Equipment
Method
Make the crust
- Preheat the oven to 375°F with a rack in the middle position.
- Whisk the flour, powdered sugar, and 1/4 teaspoon of the salt in a mixing bowl.
- Cut in the cold butter with your fingertips until the mixture resembles coarse crumbs.
- Stir in the egg yolk and ice water with a fork, then gently gather the dough into a ball.
- Flatten the dough into a disk, wrap it in plastic wrap, and refrigerate for 1 hour.
- Roll the dough between two sheets of parchment paper into an 11-inch circle and fit it into an ungreased 9-inch tart pan with a removable bottom.
- Trim the edges and prick the base with a fork, then freeze for 20 minutes.
- Set the tart pan on a rimmed baking sheet, line the shell with parchment paper, and fill it with pie weights.
- Bake at 375°F for 18-20 minutes, until the edges are pale golden.
- Remove the weights and parchment and bake for 6-8 minutes more, until the base looks dry.
- Set aside the crust and lower the oven to 350°F.
Fill and bake the tart
- Arrange the walnut halves in the tart shell.
- Whisk together the maple syrup, brown sugar, eggs, heavy cream, the remaining 2 tablespoons melted and cooled butter, vanilla extract, and the remaining 1/4 teaspoon salt until combined.
- Pour the filling evenly over the walnuts.
- Bake at 350°F for 35-45 minutes, until the edges are puffed and set, the center jiggles slightly, and the custard near the center registers at least 160°F on an instant-read thermometer.
- Cool completely on a wire rack for at least 3 hours before removing the tart ring and slicing.
Notes
For clean slices, let the tart cool completely before removing the ring. Store covered in the refrigerator for up to 3 days; it can be frozen. For a dairy-free variation, use plant-based butter and cream, though the filling texture may differ.
