Take a medium-sized lobster of 650–700 g (1 lb 7 oz-1½ lb) weight and prepare it à l’Américaine. Reserve sufficient of the cooked flesh of the lobster for the garnish and finely pound the rest of the flesh and the shell. Add this purée and the sauce from the cooking to 2½ dl (1⅓ pt or 3¼ U.S. cups) Ordinary Velouté.
Rub through a sieve and then pass through a fine strainer. Add 2½ dl (9 fl oz or 1⅛ U.S. cups) White Bouillon, reheat without boiling and finish with the liaison of 6 egg yolks and 2 dl (7 fl oz or ⅞ U.S. cup) cream and 150 g (5 oz) butter at the last moment.