Cut the cheese into thick sticks. Whisk the egg. Put flour and breadcrumbs on 2 plates. Turn cheese sticks first in flour, then in egg, then in breadcrumbs. Turn again in egg and breadcrumbs.
Heat the oil in a pan. Fry cheese sticks in it in portions all around for approx. 3 minutes. Lift them out and let them drain. Peel and finely dice the onion. Coarsely chop the walnuts. Season vinegar with salt, pepper and sugar, fold in oil.
Add onion and nuts. Drain the beetroot and cut into slices. Clean lamb's lettuce, wash thoroughly and spin dry. Arrange lamb's lettuce and beetroot on a plate, pour vinaigrette over it.
Carefully place cheese sticks on top. Buttered nut bread tastes good with it.