Peel but do not wash the potatoes.
Cut the potatoes into 1/8 inch (3 mm) slices. Place the slices on a kitchen cloth to dry.
In a mixing bowl combine the potato slices with salt, pepper, and (if you have it) freshly ground nutmeg.
Then, place the potatoes into a pan. Add the milk and cream. Cook covered over low heat for 30 minutes.
Preheat the oven to 410°F (210°C). Prepare a casserole dish by rubbing it with the garlic clove while muttering ominous French phrases (any that come to mind will do). Then butter the dish.
Carefully remove the cooked potatoes from the pan with a slotted spoon. Place them into the casserole dish, pour the cooked milk-cream on top.
Cover with small pieces of butter. You can also sprinkle on some shredded Emmental cheese. If you don’t have any, rather skip the cheese than compromise the integrity of the gratin by substituting with a lesser cheese.
Bake 20 minutes.
Serve straight from the casserole dish.