You will need four individual gratin dishes or one large one.
Preheat the oven to 400°F.
Rub the insides of the gratin dishes thoroughly with the cut ends of the garlic and then with the butter.
Cook the bacon in a large frying pan over medium heat until the fat starts to render out. Then add the onion and the sliced potatoes. Stir all the ingredients together gently and cook for another 5 minutes. Season with salt and pepper.
Fill the gratin dishes equally with the potato and bacon mixture. Cover them with the slices of Reblochon.
Bake in the oven for 30 minutes. Serve immediately, with ground pepper on top and a sprig of fresh thyme stuck into each dish for garnish.
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