Boil the potatoes in salted water until just cooked. Drain and set aside.
In a large frying pan, sauté the pancetta and onions 1 tablespoon of the butter until it begins to brown. Then add the wine and continue to cook until it has mostly evaporated.
Remove from heat and stir in the cream.
Chop the potatoes into bite-sized pieces and sauté in the remaining 2 Tbsp. of butter until some are golden brown.Season with a little salt and pepper.
Preheat the oven to 400°F (200°C).
Cut the clove of garlic in two and rub the cut side over the inside of of a baking dish (I used a deep pie pan), then layer half of the potatoes into the bottom, then add half of the pancetta and onion mixture.
Cut the reblochon or brie in half (horizontally);using plain dental floss makes this task easier than using a knife (thanks to commenter Donna for the tip). Place the bottom half of the cheese on top of the mixture in the pan, then add the remaining potatoes, pancetta, and onion mixture.
Place the other half of the cheese on top, skin side up.
Place into the preheated oven for for about 25 minutes, or until the cheese has melted and is bubbly. You can also pop it under the broiler for an extra bit of crispiness, if you like. Tartiflette can also be made into individual servings in smaller ovenproof bowls.
Serve hot with a glass of dry white wine.
Notes
Use fresh, quality ingredients for the best results.
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