Line a baking dish with sweet short pastry and blind bake at 200 degrees celcius till golden brown. Put aside.
For the lemon curd:
3 egg yolks (NO WHITE! Pull any gooey white off. It's easier now than later), juice and rind of 2 lemons, 2T sugar, 1C water, 3T cornflour. Put all into a double boiler and heat, stirring constantly, till it is thick.
Put aside, and whip the egg whites from the eggs you used the yolks of. Add 4T of caster sugar, 1T at a time, beating well after each T. Whip till it forms peaks. Add 1tsp vanilla essence and beat well.
Spread the lemon curd onto the bottom of the pastry, pour the whipped egg onto that. Bake at 200 celcius for 15-20 minutes or till golden brown.