Pastry;
Place sugar and vanilla bean into Thermo bowl and mill 10 sec/speed 10.
Add remaining ingredients except sour cream and mix 6 sec/speed 6.
Add sour cream and knead 30 sec/dough setting.
Tip dough out and push into flan tin with removable base. Freeze for 30 minutes before proceeding.
Filling;
Preheat oven to 170°C.
To make filling, place all ingredients except pecans into Thermomix bowl and beat 20 sec/speed 6.
Arrange pecans pretty side up (I know, I know, obsessive compulsive, but so pretty!) in bottom of pie shell.
Pour filling over and bake for 40 minutes until browned and fragrant.
Chill completely before cutting to serve as the filling needs to set.