Pre-heat oven to moderate (170 degrees celsius, fan-forced).
Cream butter, icing sugar and passionfruit pulp until light and fluffy.
Add sifted flour, cornflour, custard power and salt and stir to combine well.
Spoon tablespoons of mixture and roll into balls. Place onto a greased baking tray and flatten slightly with a fork.
Bake for 16-18 minutes.
Remove from oven and allow to cool for a few minutes on the tray before using a spatula to transfer the biscuits to a cooling rack.
Icing
Combine all ingredients and then drizzle over cooled biscuits.
Notes
Storing: Store at room temperature in an airtight container for up to 5 days. Freezing: Freeze in an airtight container for up to a few months. Defrost overnight at room temperature before serving.Nutrition: The nutrition information is an automatically generated estimate and is not guaranteed to be accurate.