If you are baking in a bundt tin, pre-heat the oven to 170 °C. Heavily grease the tin with pata kūteretere (softened butter). If you are using a 23 cm springform tin, pre-heat the oven to 160 °C.Grease with pata (butter) and line the base and the sides with baking paper. Add the first measure of huka one (caster sugar) in to a large bowl. Grate in the kiri rēmana (lemon zest) and kiri ārani (orange zest).
Using your hands, rub the zest in to the huka one (caster sugar) until fragrant. This step really develops the citrus flavour in the keke (cake).
Add the pata kūteretere (softened butter), wanira (vanilla) and tote (salt) to the ranunga huka (sugar mixture). Whip it on high for 4-5 minutes until fluffy.
Seperate the two hēki (eggs). Add the tōhua hēki (egg yolks) in to the butter mixture. Add the kahu hēki (egg whites) in to a medium bowl and set it aside. Whip the tōhua hēki (egg yolks) in to the butter mixture for 30 seconds or until light and fluffy. Fold in the miraka tepe (yogurt). Sift the puehu parāoa (flour) in to the butter mixture. Whētuihia - fold it.
Sift in the puehu kānga (cornflour), pēkana paura (baking powder) and pēkana houra (baking soda). Whētuihia - fold it.
Add the second measure of huka one (caster sugar) to the reserved kahu hēki (egg whites). Whip on medium-high speed until stiff peaks appear. Add a third of the meringue in to the flour mix at a time, folding well after each addition. Using a grater, grate the tiakarete mā (white chocolate) directly in to the mixture. Whētuihia - fold it.
Pour the batter in to the prepared cake tin. Smooth out the top and bake.
If you are baking it in a bundt tin, bake for 50 minutes in a 170 °C oven.
If you are baking it in a 23cm tin, bake for 55 minutes in a 160 °C oven.