For the cordon bleu, peel the kohlrabi. Cut into approx. 20 slices (each approx. 1⁄2 cm), salt. Spread a thin layer of ajvar on one side. Put the cheese on half of the coated slices. Put the rest of the kohlrabi with the ajvar side on top.
Whisk the eggs in a deep dish. Mix breadcrumbs with pizza spice on a deep plate. Put the flour separately on a plate. Turn the kohlrabi schnitzel one after the other first in the flour, then in the whisked eggs and finally in the breadcrumbs.
Preheat the oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Line the baking tray with baking paper. Heat oil in a large pan and fry escalopes in it one after the other for approx. 3 minutes on each side until crispy.
Place on the baking tray. Continue cooking in the hot oven for about 10 minutes.
For the salad, mix vinegar, some salt, pepper, mustard and 1 teaspoon sugar. Fold in olive oil. Peel and chop the shallot. Add to the vinaigrette. Wash the apple, remove seeds and dice finely.
Sort the salad, wash and drain. Mix with apple and vinaigrette. Arrange everything.