Preheat oven (electric cooker: 220 °C/circulating air: 200 °C/gas: see manufacturer). Peel and chop onion and garlic. Wash the meat, dab dry and season with salt. Heat 2 tablespoons of oil in a frying pan and fry the meat slices on each side for approx. 3 minutes. Fry the onion and garlic briefly. Deglaze with wine and 350 ml water, bring to the boil, cover and braise in a hot oven for about 2 1⁄2 hours.
Lentils in a sieve rinse and let drain. Remove meat from the roaster. Add the lentils to the stew stock and cook covered in it for approx. 30 minutes. Clean the celery and peel the carrots. Wash both and cut into slices. Add after about 10 minutes, but do not stir in.
Sort the salad, wash and shake dry. Wash parsley, shake dry and chop roughly. Mix vinegar, mustard, salt and pepper. Fold in 2 tablespoons of oil. Pluck the meat with two forks and warm it up again briefly on the lentil vegetables. Mix salad and vinaigrette. Arrange everything together and sprinkle with parsley. Bread tastes good with it.