Possible Clues:

• Breakfast for singer Moore?
• Thin-sliced, browned bread
• It's named after an opera star
• Soup and salad accompanier, at times
• Crunchy thin bread
• Base for some hors d'oeuvres
• Conductor's salute praising Dame Nellie?
• Hors d'oeuvre base, maybe
• Pound in flesh one cooks — take this with salad perhaps
• Thin-sliced crisp bread