Time to allow: Portions : Ingredients Amount Type of raw ingredient Modern Substitutes 2 small calves feet   2 lumps sugar   to taste lemon juice   Method   1 wash the feet in hot and then cold water 2 remove all hair and any fat 3 put into pan with enough water to cover them 4 boil regularly skimming the top of the pan 5 when the flesh had dropped from the bones and the liquid reduced to about half strain into a clean basin 6 strain through a jelly bag  and add lemon juice or other flavouring to the liquid 7 set in a cold place until the mixture is firm 8 remove any fat from the top 9 serve to the invalid Recipe Comments   1 boiling and skimming may take up to 6 hours, The length of process is essential to draw out the gelatine from the feet by long cooking 2 A tea towel or muslin cloth can substitute for a jelly bag 3 Lemon juice was commonly added as a flavouring  although brandy, sherry and port were also commonly added to the jelly