Possible Clues:

• Dish of dressed lettuce with croutons
• Dish containing lettuce the emperor hasn't grown?
• Arcades alas not normally providing food
• Entree meant to be eaten with the fingers, according to its creator
• Course supplement given by Classics masters to a boy?
• Special leafy side dish for comedian Sid?
• Dish with croutons and Parmesan cheese
• Dish that often includes anchovies
• Cold dish with lettuce, Parmesan cheese and croutons
• Dish made with romaine lettuce, croutons and Parmesan cheese