To Make Pastry: Put flour in a large bowl, add the butter and rub in until mixture resembles fine breadcrumbs. Stir in the caster sugar, then bind together with the beaten egg. Wrap in clingfilm and chill for 30 minutes.
Preheat oven to 200 C / Gas 6.
Roll out the dough and line a flan tin. Cover pastry with foil and add a little raw rice and bake for 10 minutes. Remove the rice and foil and bake for a further 5 minutes.
Reduce the oven temperature to 180 C / Gas 4.
Beat the eggs, add the cream, caster sugar, juice of all the lemons and zest of 2 lemons. Stir until smooth.
Pour the mixture into the flan tin and bake for 35-40 minutes until mixture is just set. Serve at room temperature and enjoy!