Treacle tart

• 200 g plain flour
• ½ teaspoon salt
• 100 g

Sift the flour and salt on to a work surface, preferably a marble slab. Make a well in the centre of the flour and put in the butter. Lightly beat the egg yolk with 3 tablespoons cold water and pour over the butter. Using your fingertips, work the egg yolk mixture into the butter, then gradually incorporate the flour. When the mixture has the consistency of coarse crumbs, gather it into a ball.