You can make the confit at any time – the day before, even.
All you do is cut the apple into quarters, remove the core, then cut the quarters into ½ inch (1 cm) slices, leaving the skin on. Then just place all the ingredients together in a medium-sized saucepan, bring everything up to a gentle simmer, then let it cook as gently as possible, without a lid, for 45 minutes to an hour – you'll need to stir it from time to time – until all the liquid has reduced to a lovely sticky glaze.
When you're ready to cook the pork chops, dip them lightly in the seasoned flour, shaking off any surplus. Now heat the oil in the frying pan and, when it's really hot, add the butter. As soon as it foams, add the chops and brown them on both sides, keeping the heat fairly high. Then lower the heat and continue to cook the chops gently for about 25 minutes in total, turning them once. While they are cooking, warm the confit, either in a saucepan or in a dish covered with foil in a low oven, while you warm the plates; the confit shouldn't be hot – just warm.
After that, increase the heat under the frying pan, then pour in the cider for the glaze and let it bubble briskly and reduce to half its original volume, which should take about 5 minutes. Serve the chops on the warmed plates, with the cider glaze spooned over and some confit on the side.