2kg/4Β½lbs dessert apples, about 12, peeled
100²µ/3Β½΄Η³ϊ caster sugar
60g/2Β½oz cold unsalted butter, diced
30g/1oz unsalted butter, melted, to add richness
300g/11oz all-butter puff pastry, rolled to a thickness of 3mm/β…›in, cut very slightly larger than the diameter of the tarte tin, pricked with a fork and frozen