Cut in the butter: Add the cubed cold butter to the flour. Using two knives in a scissor-like action, cut the butter into the flour until it resembles small peas. This helps keep the mixture cool.
Rub until breadcrumb stage: Gently rub the flour and butter together with your fingertips, occasionally shaking the bowl to lift larger lumps of butter to the surface.
Add wet ingredients: Mix the egg yolks and water. Add 2-2 1/2 tbsp of the mixture to the crumb and stir with a knife to distribute evenly. Add more liquid to dry areas, but avoid adding too much.
Form the pastry: Quickly bring the pastry together with your hands, forming it into a flat disc. Avoid overworking. Wrap in cling film and chill for 20-30 minutes.
Roll out the pastry: Lightly dust your work surface and rolling pin. Roll the pastry using short, sharp strokes, turning it 90° after each roll to prevent stretching. Roll to a thickness of about 3mm.
Transfer to tin: Carefully transfer the pastry to the flan tin using the rolling pin. Trim excess pastry.
Chill again: Cover the pastry with cling film and chill until ready to use.
Blind bake: Create a cartouche slightly larger than your tin. Line the pastry case with it and add a layer of dried beans.
Bake: Bake for 15-20 minutes in the upper third of the oven. Check if the sides are set and less translucent. Remove the beans and bake in the lower third for 5 minutes, or until the base is dry and firm.