Heat the rapeseed oil in a pan and fry the Kassel cutlets over high heat for about two minutes, turning once.
In a second pan, heat the butter and add a little salt to prevent it from splattering. Beat the eggs and fry them in the pan over medium heat, season with salt and pepper.
Arrange the Kassel cutlets on preheated plates and place a fried egg on top of each.
This goes well with mashed potatoes, freshly grated horseradish or a slice of farmhouse bread and mixed pickles.