Clean and peel the celery and cut it into 8-10 slices (a good 1/2 cm thick). Pre-cook the slices in about 1 l boiling water with salt and lemon juice for 4-5 minutes. Then take them out and pat them dry well with kitchen paper.
Drain the beetroot. Mix vinegar, salt and pepper. Whip 2 tablespoons of oil into it. Peel 1 onion, dice finely and stir in. Mix everything, let it stand for a while
Beat the eggs. Place 1 slice of ham and 1 slice of cheese between 2 slices of celery. First turn in flour, then in the egg and finally in breadcrumbs. Press the breadcrumbs well. Heat 4 tablespoons of oil in a coated pan. Fry the celery slices on each side over medium heat for approx. 5 minutes
Peel 2 onions and cut into rings. Take out the celery cutlet. Fry the onion rings in the frying fat until golden brown. Arrange everything, garnish if necessary. Served with: mashed potatoes