1.Cover base of 23cm square slab pan with biscuits, plain side down.
2.Combine cream and milk in large bowl, add pudding mix. Beat with rotary beater for about 1 minute or until smooth. Pour pudding mixture over biscuits. Top with a single layer of biscuits, plain side down.
3.To make passionfruit icing, combine sifted icing sugar, passionfruit pulp and butter in a small heatproof bowl. Stir over hot water until icing is spreadable.
4.Top slice with icing; refrigerate overnight before cutting.