One bought pre-baked pastry case
One 400g tin of condensed milk
Three eggs - separated
Caster sugar
Lemon juice (fresh)

Mix the milk and three egg yolks together then beat in the lemon juice (quarter of a cup)

Put mixture into pastry case and top with meringue mixture - cook for about 15 - 20 minutes or until golden in over about 170 degrees.

My lot polished off in seconds.