Prepare some hard boiled eggs, shell and cut into disks one third of an inch thick.
Melt in a saucepan a piece of butter in which brown half an onion cut into thin slices, to be removed from the butter when browned. Then add to the butter two teaspoonfuls of flour, mix but don't allow to brown, thin with a cup of hot broth, add salt and pepper and let simmer for ten minutes. Put the sliced eggs in the sauce to warm them, stir a little, but carefully to avoid breaking them, and do not boil again. Just before serving add to the sauce a teaspoonful of cream and stir carefully.