Line a pie dish of ± 26 cm in diameter with the pastry.
Combine the milk, rooibos tea, butter and cinnamon sticks in a saucepan. Bring to a slow boil. You do not want the milk to get scorched.
Switch off the heat and leave to stand for 15 minutes for the rooibos tea to infuse.
Remove the tea bags and the cinnamon sticks.
Whisk together the flour, corn flour, sugar, salt, vanilla and egg yolks in a bowl and add a little of the infused milk and stir to form a paste.
Add this to the remainder of the warm liquid and stir over very low heat until thick. Remove from the heat.
Beat the egg whites in a clean glass bowl until soft peaks form.
Fold the egg whites gently into the milk mixture.
Pour into the prepared pastry shell. Sprinkle with cinnamon sugar if desired. (I love adding extra cinnamon)
Bake in a preheated oven at 200 °C for 10 minutes.
Lower the heat to 180 °C and then bake for a further 25 minutes.
Leave the tart to cool completely before serving.