Cheese rind. Cut the slices into 3 equal triangles. Cut ham into wide strips. Wash the sage, dab dry and remove the leaves. Cut each cheese corner about halfway along the long side.
Fill with ham and a sage leaf. Put the flour and breadcrumbs on a plate. Beat the egg on a deep plate with a fork. Season with pepper. Turn cheese corners first in flour, then in egg and finally in breadcrumbs.
Press the breadcrumbs slightly. Heat the oil in a large pan. Bake the cheese corners in it for 2-3 minutes on each side until golden brown. In the meantime clean and wash lettuce and drain well. Put the lettuce on a plate.
Arrange cheese cordon bleu on top. Garnish with the remaining sage leaves and lemon as desired. Pumpernickel tastes good with it.