Line a 23 cm square tin with baking paper. Pre-heat the oven to 165 degrees, bake setting.

Set aside 1 cup of the hua tio (frozen berries) to go on top of the slice. Keep them in the freezer as you make the slice.

Add the remaining hua tio (frozen berries) and huka hāura (brown sugar) into a frying pan.

Over high heat cook the berries and sugar for 3 minutes until the huka (sugar) has dissolved. Try to keep the berries whole if you can.

Mix the puehu kānga (cornflour) and wai rēmana (lemon juice) together. Add it into the berry mixture and cook over medium heat for 2 minutes, until thickened. Stir gently so the berries stay whole.

Remove from the heat and allow to cool in the pan.

Add the pata kūteretere (softened butter), huka hāura (brown sugar), wanira (vanilla) and kiri rēmana pīrahirahi (finely grated lemon zest) in to a large bowl. Whip on high for 3-4 minutes until fluffy and creamy.

Add the hēki (egg) and whip for 30 seconds.

Add in the kokonati pūtī (desiccated coconut), puehu parāoa noa (plain flour) pēkana paura (baking powder) and ōti (oats) in to the butter mixture. Stir well with a wooden spoon.

Add half the oat mixture in to the base of the prepared tin and press it down firmly with the back of a spoon. Take the time to press it well in to the corners of the tin. Add the cooled berries and the jam on top.

To the second half of the oat mixture, add the extra ½ C ōti (oats) and mix with a spoon. Sprinkle this over the top of the berries in big clumps.

Add the cup of reserved hua tio (frozen berries) in the gaps of the oat crumble.

Bake for 50 minutes until golden.

Plain option: Remove it from the oven, allow to completely cool and cut in to desired pieces.

Fancy Slice option: Remove it from the oven, allow to completely cool. Drizzle with:50 g tiakarete mā kua rewaina (melted white chocolate) And a handful of rōpere tauraki-tio (freeze-dried strawberries)Chill it for 10 minutes or until it is set and cut in to desired pieces.

Dessert option: Allow the slice to cool in the tin 10 minutes or so. Slice in to desired pieces and add to plates. Top with aihikirīmi (ice cream) and eat warm as the aihikirīmi drips over the delicious slice.