Cut the boneless pork shank into large chunks, roughly 5-6 cm (2-2.5 inches) in size.
Place the pork shank pieces in a pressure cooker and add about 500 ml of water and a pinch of salt.
Cook the pork under high pressure until it's very tender, which usually takes about 45-60 minutes once pressure is reached.
Once cooked, carefully release the pressure and set the tender pork aside. Reserve the cooking liquid if you wish to add extra flavor to the sauerkraut.