Preheat oven to 180ºC.
Combine crushed biscuits and melted butter and press into a pie dish.
Whisk together Condensed Milk, lemon juice, lemon rind, egg yolks and granadilla pulp.
Pur into biscuits shell.
Beat egg whites until stiff, gradually adding castor sugar.
Beat in vinegar and cornflour. (This will stabilise the merigue).
Pile on top of filling.
Bake for 10 minutes or until lightly browned.
Chill before serving.
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