Cut the leek sticks into pieces approx. 10 cm in size, wash them thoroughly and cook for 20 minutes depending on the strength. Drain and let cool. The 4 leeks made 16 pieces. I wrapped half a slice of ham around each of the thinner pieces and a whole slice of ham around the thicker pieces.
Now put everything in a greased baking dish and sprinkle with the cheese and put a few flakes of butter on top and bake at 190 ° in the preheated oven for about 20 minutes.