Line a large baking tray with baking paper. Pre-heat the oven to 170 °C. Add the huka one (caster sugar) in to a large bowl. Finely grate the kiri rēmana (lemon zest) in to the bowl. Rub the kiri (zest) in to the huka (sugar) with your hands until the rēmana (lemon) is fragrant.
Add the pata kūteretere (softened butter), wanira (vanilla) and tote (salt) in to the sugar mix. Using a hand mixer, whip on high for 3 minutes until light and fluffy in colour.
Add the hēki (egg) and whip again for 30 seconds on medium speed.
Add in the puehu parāoa (flour), puehu kānga (cornflour) and pēkana paura (baking powder). Stir well with a fork or wooden spoon.
Mould the mixture in to 20 equal sized balls.
Place them on the prepared tray, with a large gap in between each one. Squash the balls down with the palm of you hand and make a large dent in the centre with your thumb or with the round wooden handle. Make it large so you can fit heaps of preserve or tiamu (jam) in. Fill each of the holes with the tiamu (jam), filling them to the top.
Bake for 12 minutes. Cool for 5 minutes before eating. These pihikete (biscuits) will keep well for 7 days in a sealed container in the fridge or in a cooled cupboard.