Put into a mortar equal parts of boiled lobster meat and boiled rice; pound them to a pulp; then add enough broth to dilute it; season with salt and paprica. Pass it through a sieve. Heat it without boiling, and then add enough Bechamel sauce to make it the consistency of cream soup; lastly, add to each quart of soup a quarter of a pound of lobster butter, adding a little at a time, and stirring until the butter is melted. Instead of the lobster butter, plain butter may be used, and the coral of the lobster, dried and pounded to a powder, stirred in at the same time. Serve croutons with the bisque.