It is essential you score the skin deeply to ensure a good crackling surface. For this you also need to rub lots of salt and oil in too.
Place in a large deep baking tray. Pour 2cm of cider into the base and sprinkle caraway seeds over the pork knuckles.
Roast at 180°C for approximately 2 hours.
Roast pork Knuckle is not a dish that should be served in dainty portions. The Germans cut the pork thickly or in parts of Bavaria just drop a whole knuckle on each plate. You can drink red or white with this dish, or if you are feeling authentically 'oompah' try it with a large glass of ice cold german lager. Prosit!