Possible Clues:

• You'll be sorry if you've got this answer down
• It's eaten in humiliation
• Eat this by way of apology
• Food of the repentant?
• One's apologising for eating it
• Apology for consumers?
• The dish to eat by way of an apology
• It's embarrassing to eat
• Alternative to crow?
• What one eats when accepting humiliation