Preheat oven to 180°C. Line a 20cm pie tin with baking paper.
Unroll pastry into prepared tin, pressing into the corners. Trim edges and fill any gaps as needed. Cover with another piece of baking paper and fill with baking beans or dry rice. Blind bake for 25 minutes, until golden.
Meanwhile, peel apples and dice 1cm. Place butter, apples and sugar in a small pot on medium heat. Cook for 10-15 minutes, until apples are softened. Toss through cornflour, until coated and then fold through boysenberry compote
Remove baking beans/rice from pastry. Pour filling into pie base.
Bake pie for a further 5 minutes, until pastry is golden. Allow to cool for 5 minutes.
Whip cream and serve with warm pie.