Mix 1 egg with the ground veal, then mix in the finely diced onion, salt, and pepper. Shape into medium-size balls.
In a pot, bring about half a quart (½ l) of water (just enough to cover the meatballs) to a boil. Lower the heat, put the meatballs in, add a bouillon cube, and cook for about 20 minutes.
Prepare the sauce: On low heat melt the butter, add