Possible Clues:

• Retain alcoholic drink as souvenir
• Lock of hair, maybe
• What restaurants in Tokyo do as a memento?
• Token food before drink
• Japanese bar-owner would have this to remember one by
• Souvenir from stronghold, a Japanese drink
• Memento Japanese bar will do?
• Reminder
• Prom corsage, perhaps
• What Japanese publicans will do for souvenir?