Mix the dressing with a hand blender: Peel 1 shallot and chop it finely. Puree with 5 tablespoons of light vinegar (e.g. sherry vinegar), 100 ml apple juice, 1 teaspoon Dijon mustard, a little salt and pepper, and mix in 100 ml oil (for salad dressings, it is best to use cold-pressed oils such as olive oil, rapeseed oil, nut oil).
For the mashed celery and potatoes peel, wash and cut into 1-2 cm pieces. In a saucepan, cover with hot water and cook covered for about 15 minutes until soft.
In the meantime, preheat the oven (electric cooker: 200 °C/circulating air: 180 °C/gas: see manufacturer). Clean, wash and spin-dry lettuce.
Heat the oil in a frying pan. Wash chops if necessary, dab dry and fry for about 2 minutes on each side. Place in an ovenproof dish and continue cooking in a hot oven for about 3 minutes.
Deglaze the frying set in the meat pan with vinegar and 1⁄4 l water. Stir in jelly and bring to the boil. Wash thyme and add to the sauce. Boil down the sauce for about 3 minutes, season with salt and pepper. Keep warm.
Remove the meat from the oven, wrap it in aluminium foil and let it rest for about 5 minutes. Heat cream and butter. Drain celery and potatoes and let them steam briefly. Gradually add the cream mixture to the vegetables with a potato masher. Season with salt and nutmeg. Mix salad with dressing. Serve with chops, sauce and mashed potatoes.