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Easiest and yummiest custard slice you'll ever make! One of my friends is addicted to it and I have to bring it to every Girl's Night we have or else! My dad says it's the best he's ever tasted. You can try adding cocoa powder to make a choc custard. I haven't tried that yet.
- Place piece greaseproof paper onto a flat biscuit tray and spray with cooking spray. Put a sheet of puff pastry on tray and pierce all over with a fork, but don't go all the way through pastry.
- Put in oven about 200°C until puffed up and golden.
- Let cool for a few minutes and gently push pastry down (I use a teatowel so my hands don't get burned) so it's flat. Take it off baking tray and remove paper.
- Put pastry into a square dish that has been greased and lined with greaseproof paper. If pastry too big trim the sides a little. It should be a snug fit.
- Bake second sheet of pastry, remove the paper and set pastry to one side until custard is done.
- For the custard, put the sugar and custard powder into a large saucepan and mix together with a wire whisk.
- Add the milk and mix to combine well.
- Put saucepan on stovetop and heat on medium high until mixture begins to thicken, then lower the heat until mixture is very thick and hard to stir. I find using the wire whisk until mix begins to thicken prevents lumps, then use a spoon to stir it.
- Add vanilla and mix well then pour into prepared dish.
- Smooth top so it's even and put 2nd pastry sheet on top.
- The icing amount depends on how thick a layer you want it, but I usually melt about 1 tablespoon of butter with 1 teaspoon boiling water. Then I add icing sugar, passionfruit pulp and a bit of water or lemon juice until it's the right consistency and amount--you don't want it too runny.
- Pour the icing on top and put in fridge for a few hours or overnight.
- Cut into squares and enjoy!