The key is to use a mixture of sweet and tart apples, 2 parts potato, 1 part apple. Jonagolds, Braeburns and Jonathans will do well by themselves as they possess both flavors.
8 large potatoes
4 apples (2 sweet, 2 tart)
4 slices of salted pork
Slice the pork in narrow strips, mix in with the mashed potatoes and serve. Good with a lick of mustard.