4 lemons, zest and juice
200g/7oz plain flour, plus extra for dusting
1 tsp caster sugar
200g/7oz caster sugar
175g/6oz caster sugar
50²µ/1ΒΎ΄Η³ϊ cornflour
Β½ tsp vanilla extract
125g/4Β½oz cold butter, cut into cubes
1 free-range egg, beaten
1 free-range egg plus 3 free-range eggs yolks
3 free-range eggs whites