Peel the potatoes and fruits. Core the fruit. Cut or slice both in 2 - 3 mm thick slices. Spread evenly and thinly in a large, flat casserole or gratin dish. Place a slice of fruit after every third to fourth slice of potatoes and season with salt and pepper.
Peel and squeeze the garlic. Mix with the wine, cream, mustard and crème fraîche and season with salt and pepper. Spread the mixture over the potatoes so that everything is evenly covered with it.
Bake in the oven on the middle rack. After about 5 minutes, reduce the temperature to 160 ° C and bake until golden brown in about 1 hour.