Note: The pastry component of this recipe makes enough for 2 tarts.
Rub the butter and flour together until you have fine breadcrumbs.
Mix the egg yolks with the icing sugar and then add to the flour and butter.
Mix and bring together but do not overwork.
Rest for one hour in the fridge.
Grease and lightly flour a 28cm x 2.5cm (11" diameter x 1" deep) plain flan ring and place on a rubberised mat or silicone paper, ensure you have a heavy flat baking tray to cook the tart on.
Roll out the pastry to a thickness of 3mm (0.11 inch) and then line the mould carefully pushing the pastry into the corners.
Line the tart with parchment paper or heavy duty cling film before filling with baking beans.
Chill for at least one hour.
Once rested bake at 180˚ C/ 356° F or until golden, remove the beans and return to the oven for the base to finish cooking.
Seal the pastry by brushing with egg yolk, place back in the oven to cook the egg.