There weren't any specifics given for this paring suggestion, but I don't think it matters what kind of ham or what kind of potatoes you prepare. What else could go better with a hearty farm meal than a beer that was historically brewed to quench the thirst of weary farmhands?
Imagine with me, if you will. The salty and savory flavors in the ham and potatoes. You can taste them, can't you? This hearty meal needs a beer that will contrast against those flavors and mouthfeel. In comes the Hinterland Saison. The carbonation and light citrus flavors start cleansing the palate immediately and then the peppery spices and alcohol finish the job as you swallow. Your pallet will be refreshed and ready for the next bite.
There is no need to spice the ham or potatoes as the saison will do that for you as you swallow. However, if you want to add some resonating flavors I suggest seasoning the ham or potatoes with some sage or pepper. Those flavors will be showcased as they mix with the yeast and specialty spices in the beer.