Warm apple tart has a brilliantly sharp flavour and versatility that allows it to transform from homely to elegant. The apples need to shine,so whatever pastry or other filling you use make sure they support,rather than conflict,with the apples. Here,I've flavoured the butter almond pastry lightly with cardamom and ground ginger,but you could instead use an equal measure of ground allspice or nutmeg if preferred.