For the sauce, mix well the vinegar and oil, mustard, pear syrup and spices.
Fry the bacon cubes in a non-fat frying pan. Add the roughly chopped nuts and fry them briefly. Add everything to the sauce.
Peel the celery and slice it into fine slices, blanch in salted water for about 2-3 minutes, drain and drain well. Mix with the sauce and let it steep for a few minutes.
Divide the pears into quarters, remove the core and slice them together with the peel. Mix everything well again.