Season the pork fillet with pepper and fry in the oil for about 8 minutes. Season with salt and remove from the pan. Wrap in aluminum foil and keep warm in the oven.
Wash the plums, cut in half, stone and cut into wedges.
Heat the butter in the pan and sauté the plums briefly. Pour red wine. Add the honey, ginger, bay leaf and juniper berries and simmer for about 10 minutes over a low heat.
Pour the creme fraiche into the plum sauce, season with salt, cinnamon, allspice and pepper.
Take the fillet out of the oven, unwrap it and cut it into thin slices.
Let the meat soak in the plum sauce for about 2 minutes.