Heat grill to high. Stone and slice the peaches. Place the biscuits in a plastic food bag and crush with a rolling pin. Arrange the peaches and the crumbled biscuits in the bottom of an ovenproof dish. Spoon over the crème fraîche, smooth with a knife so the peaches are entirely covered, then sprinkle over enough sugar to cover the crème fraîche. Place the dish under the grill for 3 mins or until the sugar has caramelised.
Make it with berries
Berry Brulèe: Swap the peaches for 200g strawberries, quartered, and 200g raspberries. In a sealable freezer bag, smash 4 shortbread fingers into chunks. Mix through with the berries and place in the bottom of an ovenproof dish. Cover with crème fraîche and a layer of demerara sugar as before and grill until the sugar is caramelised.