Ingredients:

Pastry
1 egg
9 oz flour
4 1/2 oz butter
3 oz icing sugar

Directions:

Prep the oven at 300 degrees F /150 degrees C/ gas mark 2
For the pastry, rub the flour and butter together, thoroughly incorporate the sugar and then mix to form a soft paste with the egg.

Leave this to rest for 20 mins or so on the counter at room temp.
Roll out to 1/8 inch thickness and use to line a 12 inch flan ring.
Bake for 7 mins, just to set the pastry.
Grate and juice all the lemons, beat into the eggs, add the cream and sugar.
Pour into flan case and bake in the middle of the oven for 50 mins or until the tart is almost set in the middle.
Dust with icing sugar just before serving.