Wash the cured pork loin and pat dry. Heat 1 tablespoon of oil in a flat roasting pan or in an ovenproof pan. Brown the meat in it all around for about 5 minutes. Continue to cook in the preheated oven (electric cooker: 150 °C/circulating air: 125 °C/gas: level 1) for 15-20 minutes.
For the apple vinaigrette, peel the onion. Peel and wash the celery. Wash, quarter and core the apple. Dice everything finely.
Heat 2 tablespoons of oil in a frying pan. Fry the onion and celery cubes for about 4 minutes. Add apple cubes, 5 tbsp. water and stock. Bring to the boil again. Remove from heat and season with vinegar, mustard, pepper, a little salt and 1 pinch of sugar.
Cut baguette into slices and roast in a toaster if necessary. Cut meat into thin slices and arrange on a plate with the vinaigrette. Add the baguette.