Peel and slice the jacket potatoes. Also peel the pears and cut into wedges (if necessary, braise hard varieties in a little liquid beforehand). Layer the potato slices and pear wedges like a roof tile in a large, flat baking dish. Season with salt and pepper. Cut the Gruyère into thin slices, spread over them and finally pour the single cream over them.
Bake in a preheated oven at 200 degrees for 15-20 minutes.
Also suitable as a full main meal together with a mixed salad.