1. Preheat the oven to 220C/Gas 7/fan oven 200C. Peel and thickly slice the potatoes, boil in salted water for 8-10 minutes, until just tender. Drain.
2. Sauté the finely chopped onion in Rapeseed oil until soft, add 200g of bacon lardons, stir well and cook for a further 5 minutes
3. Place half of the potatoes in a buttered ovenproof dish, add half of the bacon & onion mix, season with salt and pepper. Repeat layers, pour over the créme fraíche
4. Slice the reblochon in half lengthways, place on top of the mix and bake until golden and bubbling. Serve hot as a main or side dish. Enjoy with a crispy baguette and a glass of Reisling