Possible Clues:

• Rich yellow food in salad stuffed in mouth, perhaps?
• One of the five 'mother sauces' of French cuisine
• All in ad dancing around in stockings -- sauce!
• One of Auguste Escoffier's ''mother sauces''
• Rich sauce
• Sauce made with butter, egg yolks and lemon juice
• Sauce used with fish
• Sauce in salad tossed into jam
• Lines for article in carrier with first class directions for making sauce
• Sauce, eg for asparagus