Melt the butter in a sauté pan and sauté the potatoes until lightly browned all over.
Cut the ham into thin strips and sauté with the potatoes for 1 - 2 minutes, then transfer to an ovenproof dish and bake in the oven for 20 minutes.
Meanwhile, trim the pork and cut into medallions. Season and fry until well browned, then place in the oven for about 8 minutes or until cooked. Remove from the oven and keep warm.
Pour the beer into the pan in which the pork was fried and simmer for 2 minutes, then add the cream and simmer for a further 1 - 2 minutes. Season to taste.
To serve, place the pork medallions on four serving plates and mound the potatoes on top. Pour the sauce over the meat and serve at once.