This is a very Hungarian dish called unromantically Sliced Potatoes (Rakott Crumpli), which we as children pronounced Rocket Crumple:

Many cold leftover boiled potatoes, sliced; set aside the roundest, most even, prettiest slices
Many cold hard-boiled eggs, sliced
Much spicy Hungarian sausage (kolbász), sliced
Butter
Sour cream
Baking dish, thoroughly buttered
Preheat oven to 350*F; it will take you a long time to slice everything

Start bottom with potato slices; dot each slice generously with butter; add a layer of egg, a layer of sausage, and press down firmly with flat of hands to remove air; slather with blobs of sour cream. Repeat, not forgetting to press down on each set of layers before starting the next set. Do not be afraid of either the butter or the sour cream. Finish top with the prettiest potato slices and butter each of those. Bake for about an hour or till the potatoes on top are nicely browned and crunchy (all ingredients are already cooked, you are only "uniting" everything).
You end up with something hot and filling and rich as all getout, but incredibly delicious, as the flavor of egg and sausage has been carried throughout the dish by the butter and sour cream... wonderful. Mmmm.