📖 Instructions

1. Step 1: Get your butter ready for the crust. Take 1 cup (2 sticks or 226g) of unsalted butter and cut it into small, 1/2-inch cubes. Pop these cubes into the freezer for at least 15 minutes. This chilling step is super important for a flaky crust! Why? Because when tiny pieces of cold butter hit a hot oven, the water in the butter rapidly evaporates, creating steam that puffs up the layers of dough. If your butter is too warm, it'll just melt into the flour, resulting in a tougher, less flaky crust – and we definitely don't want that for our gorgeous tart, do we?
2. Step 2: Prepare your dry ingredients for the crust. Grab a large mixing bowl and sift together 2 ½ cups (300g) of all-purpose flour and 1 teaspoon of salt. Sifting helps to aerate the flour and prevent lumps, ensuring a more uniform and tender crust texture.
3. Step 3: Cut the cold butter into the flour. Add the frozen butter cubes to the flour mixture. Using a pastry blender or your fingertips, quickly work the butter into the flour until the mixture resembles coarse meal with some pea-sized pieces of butter still visible. The key here is to work quickly to prevent the butter from warming up too much.
4. Step 4: Gradually add ice-cold water. Slowly add 1/2 cup (120ml) of ice-cold water, one tablespoon at a time, mixing gently after each addition. Only add enough water until the dough just barely comes together. It should still look a bit shaggy, not sticky or wet. Over-mixing at this stage develops gluten too much, which leads to a tough crust.
5. Step 5: Form and chill the dough. Turn the shaggy dough out onto a lightly floured surface. Gently gather it into a disk. Don't knead it excessively! Wrap the disk tightly in plastic wrap and refrigerate for at least 30 minutes, or up to 2 days. This rest allows the gluten to relax, making the dough much easier to roll out, and further chills the butter.
6. Step 6: Roll out the tart dough. Once chilled, remove the dough from the fridge. On a lightly floured surface, roll it out into a 12-inch circle, approximately 1/8 inch thick. If the dough cracks, just gently press it back together with your fingers. If it sticks, sprinkle a little more flour, but sparingly.
7. Step 7: Line the tart pan. Carefully transfer the rolled dough into a 9-inch tart pan with a removable bottom. Gently press the dough into the bottom and up the sides of the pan. Trim any excess dough around the edges, leaving a slight overhang; you can use the rolling pin to roll over the edges for a clean cut. Prick the bottom of the crust all over with a fork (this prevents air bubbles and puffing).
8. Step 8: Chill the tart shell again. Return the prepared tart shell to the refrigerator for another 15-20 minutes. This second chill is super important as it helps prevent the crust from shrinking down the sides of the pan during baking.
9. Step 9: Preheat your oven and blind bake. Preheat your oven to 375°F (190°C). Line the chilled tart shell with parchment paper or aluminum foil and fill it with pie weights, dried beans, or uncooked rice. This process, called blind baking, ensures the crust stays flat and doesn't get soggy once the filling is added.
10. Step 10: Bake the crust. Blind bake for 15 minutes. Carefully remove the parchment paper (or foil) and the weights. Then, continue to bake the crust for another 5-7 minutes, or until it's lightly golden brown. Take it out of the oven and let it cool slightly on a wire rack while you prepare the filling. *Important: Reduce your oven temperature to 350°F (175°C) now!*
11. Step 11: Prepare the maple walnut filling - eggs. In a large bowl, whisk together 3 large eggs until they are just combined. You don't want to incorporate too much air, just enough to break them up.
12. Step 12: Mix in the wet ingredients for the filling. Stir in 1 cup (240ml) of pure maple syrup (grade B or dark amber for richer flavor, if you have it, trust me!), 1/2 cup (100g) of packed light brown sugar, and 1/4 cup (57g) of melted unsalted butter. Whisk everything together until it's smooth and well combined and the sugar has mostly dissolved.
13. Step 13: Add flavorings to the filling. Stir in 1 teaspoon of vanilla extract and a tiny pinch of salt. The salt really helps to balance the sweetness and bring out the other flavors.
14. Step 14: Fold in the walnuts for the filling. Gently fold in 1 ½ cups (180g) of chopped walnuts into the maple mixture until they are evenly distributed. Don't stir too vigorously, just enough to combine.
15. Step 15: Create the crunchy walnut topping. In a separate small bowl, combine 1/2 cup (60g) of chopped walnuts, 2 tablespoons (28g) of melted unsalted butter, 2 tablespoons (25g) of light brown sugar, and 1 tablespoon (15ml) of maple syrup. Mix until all the walnuts are evenly coated with this delicious, sticky mixture. Set this aside.
16. Step 16: Assemble the tart. Pour the prepared maple walnut filling into your partially baked and slightly cooled tart shell. Spread it out evenly using a spatula, making sure the walnuts are distributed nicely.
17. Step 17: Add the crunchy topping. Evenly sprinkle the crunchy walnut topping mixture you just made over the top of the filling. Don't worry if it looks a little rustic; it's going to caramelize beautifully.
18. Step 18: Bake the tart. Carefully place the tart (still in its pan) on a sturdy baking sheet. This helps to catch any potential spills and makes it easier to transfer to and from the oven. Transfer it to your preheated oven (which should be at 350°F/175°C).
19. Step 19: Monitor the baking. Bake for 40-50 minutes, or until the filling is set around the edges but still has a slight wobble in the very center when gently shaken. The topping should be gloriously golden brown and caramelized. If you notice the topping browning too quickly, you can loosely tent the tart with a piece of aluminum foil.
20. Step 20: Cool the tart completely. Remove the tart from the oven and immediately place it on a wire rack to cool completely. This step is absolutely crucial! The filling will continue to set and firm up as it cools, so resist the urge to cut into it too soon. Patience, my friend, patience – it’s worth the wait. This usually takes at least 2-3 hours.
21. Step 21: Serve your masterpiece. Once completely cooled, carefully remove the outer ring of the tart pan. Slice with a sharp, thin knife (wiping it clean between slices for neatness) and serve at room temperature. A dollop of freshly whipped cream or a scoop of vanilla bean ice cream makes for a truly indulgent experience. Enjoy every single, delectable bite!