Sift the flour, sugar and salt into a bowl. Rub in the butter until it look like breadcrumbs, and stir in the lime zest. Press this mixture into a greased pan (9 x 13 inch) and bake at 325 F for 20 minutes.
2
Whisk the eggs, sugar, lemon juice and rind until well combined. Pour over the warm base and return to the oven for 40 minutes until set.
