Preheat the oven to 165 °C.
Add the pihikete wīti (wheat biscuits) and kokonati pūtī (desiccated coconut) in to a tāwhirowhiro (food processor). Whizz it all together until you get a fine-ish crumb.
Add in the pata kua rewaina (melted butter) and whizz for 10 seconds or so.
Using a measuring cup, press the kongakonga pihikete (biscuit crumb) firmly in to a 20 cm tart tin. You can also use a 20 cm springform cake tin or one with a removable base.
Bake the base for 10-12 minutes in the pre-heated oven until lovely and golden. Cool the base for 5 minutes.
Turn the oven down to 140 °C. If your oven only has a fan bake setting, turn the oven down to 130 °C.
After the base has cooled slightly, gently stir the kahitete raimi (lime custard) and pour in to the base.
Bake for 30 minutes in a 140 °C oven. If at the 30 minute mark there is still heaps of wobble in the custard, bake for 5 more minutes. Remove from the oven and cool. Please note - the custard will still have some wobble in it, this creates a creamy finished product so don't worry. It will set further in the fridge. Cool for 20 minutes on the bench and then transfer the pie into the fridge. Cool for at least four hours but overnight is better for the flavours to deepen. This will keep well in the fridge for up to 5-7 days, I cover mine with a bowl cover or a plate.