Peel, wash and coarsely dice the potatoes and celeriac. Cook in salted water covered with lemon juice for about 20 minutes
Clean and wash the lettuce and tomatoes. Halve the tomatoes. Mix vinegar, 2-3 tablespoons water, mustard, salt, pepper and 1 pinch of sugar. Fold in 1 teaspoon of oil.
Cut the bacon in half lengthwise. Wash the fillets, dab dry and season with pepper. Wrap 1/2 slice of bacon around each fillet. Fry in 1 teaspoon hot oil all around for about 10 minutes
Wash the rosemary, chop coarsely. Drain the cranberries, collect the juice. Keep fillets warm. Fry rosemary briefly in hot frying fat. Deglaze with stock and about 5 tbsp. cranberry juice. Reduce slightly over high heat. Add the cranberries. Season to taste with salt and pepper
Drain potatoes and celery and mash finely. Stir in milk. Season to taste with salt and nutmeg. Mix the prepared salad ingredients. Serve everything