Make pastry as described and roll to fit flan dish taking great care not to stretch the pastry
Leave to rest before trimming and gently pricking the base
Line with foil and baking beans
Bake for 15-20mins, remove foil and ensure pastry is ‘dry’
Make filling:- take rind and juice from lemons
Mix cornflour, lemon juice and 2 tablespoons of water to a paste
Whisk into remaining water and heat, gently whisking to ensure no lumps
Simmer for 3 mins
Remove from heat, stir in lemon rind
Cool slightly, stir in yolks and sugar. Cool slightly
Pour into flan case
Whisk egg whites in a clean bowl until stiff (tip bowl upside down and the white shouldn’t move)
Gradually whisk in sugar
Pipe or spoon over the lemon filling
Bake for 15mins