After the meat is removed from the lobster, take all the rest (except the lady, woolly gills and intestine), including the shell, and put it into a mortar with twice its weight of butter. Pound it to a pulp; then place it in a saucepan on the fire, and cook until the butter is melted. Strain it through a cloth. Beat the strained butter until it is cold. If not a deep enough color, add a very little cochineal.