(2017) The Pedro Ximénez grapes (popularly shortened to 'PX') have been partially dried in the Jerez sun, so the wine is effectively made from raisins rather than freshly picked grapes. That makes it a dark and unctuous liquid, brimming with rum-soaked raisins, chocolate and coffee and walnut aromas, a lick of salt and zest of Seville orange. Very sweet with 400g/l of residual sugar, it is mouth-coating and beautifully balanced by its acidity, making it a great partner for your bitterest dark chocolate desserts. There are more profound examples, but it's very good indeed, well priced, and widely available too.
(2015) PX is a very special style of Sherry, made not from Palomino but from Pedro Ximénez grapes which are also partially dried so that in fact the wine is made from raisins, meaning it is dramatically dark, rich, thick in texture and filled with lusciously sweet flavours. From walnuts and orange to prunes and plump, liquidised raisins, it is fabulous stuff and a small glass goes a long way such is its decadence. Have it with your Christmas pud.