1: Cut 4 slices bread, but not too thick. Butter the slices lightly and sprinkle with 2 tablespoons dry white wine.
2: Boil 200 g potatoes and when cooked, peel and slice.
3: Heat 2 tablespoons oil in a frying pan on medium heat. When the oil is really hot, fry the potato slices on both sides. Set aside.
4: Use the same pan to fry 4 slices smoked ham for just a few seconds on each side. Preheat the oven to 210°C (420°F).
5: Distribute the ham over the slices of bread.
6: Arrange the sliced potatoes on top.
7: And finish with the cheese. Put in the oven for about 15 minutes.
8: Take out of the oven as soon as the cheese has fully melted and is lightly browned on the top. Serve immediately, with a good green salad if possible.
Remarks
You can replace the Espoisse with another kind of cheese. I prefer one that is both soft and well-flavoured (Saint Nectaire, Saint Marcellin, Mont d'Or...) but it's just as good with Comté or Cheddar.