Cut thin slices of rye bread; butter before you take them from the loaf. Spread each slice with a thin layer of limburger cheese. Cut bologna sausage into the thinnest possible slices; cover the limburger with the sliced bologna, and then a thin piece of pumpernickel; cover with another slice of bread that has been coated with a layer of cheese. Press the two together; do not remove the crusts. Serve on a napkin in a wicker basket.