Make sure that your butter is at room temperature and soft. In a bowl, mix with your finger tips butter, sugar, flour, salt and sugar until you get a crumble-like texture.
Add milk and egg yolk and mix with your hand until you get something homogenous. Do not overmix though as an overmixed dough will tend to retract when baked.
Spread the dough into a thick rectangle. Cover well with saran wrap and Let the dough rest in the fridge for at least 1 hour.
Pecan filling
In a bowl, whisk together eggs, sugar and maple syrup. Add sifted flour and whisk. Finally add finely chopped pecans.
Assembly and baking
Spread your dough until you get a thickness of approximately 3 mm. Line your dough into a tart ring or tart pan. Fill with the pecan filling up to 3/4 of the pie crust to leave room for the whole pecan. Add pecan one by one on a circle.
Bake in the oven at 180C (360F) for 40 minutes. or until your pie is golden brown.