Wash the duck breast, dab dry and cut into thin slices. Peel and wash the potatoes and cut them lengthwise into slices. Wash and halve apples, remove core. Cut apples into thin slices.
Heat 1 tablespoon of oil in a special pan. Sauté the duck breast in it and deglaze with Calvados. Season with salt and pepper. Push the meat onto the warmer rim or remove it and keep it warm.
Heat the remaining oil. Brown the potato wedges and continue to fry over medium heat, turning for 10 minutes. Turn from time to time. Also season with salt and pepper. Add apple slices shortly before the end of the cooking time.
Wash the thyme, dab dry and remove the leaves. Mix the duck breast slices with the potatoes. Sprinkle with thyme leaves. Mix the crème fraiche and put it on the potato pan.
Sprinkle with pepper.