In a food processor, combine the flour, sugar, and salt. Add the butter and pulse a few seconds at a time until it is the size of peas. Add the water and oil. Pulse again until the dough just begins to form. Add water, if needed. Remove the dough from the food processor and form into a disc.
On a floured work surface, roll out the dough and line a 23-cm (9-inch) Pyrex pie plate. Refrigerate for 30 minutes.
With the rack in the lowest position, preheat the oven to 180 °C (350 °F).
In a bowl, combine the brown sugar and cornstarch. Add the eggs and whisk until the mixture is smooth. Stir in the maple syrup, nuts, and butter. Pour into the crust. Bake for about 40 minutes or until the centre of the filling is set.
Let cool before serving. Store at room temperature.
Recipes with the "Healthy Pick" stamp have been evaluated by a registered dietitian member of the Ordre professionnel des diététistes du Québec.