Related Clues:

• Like blue moons
• Like white elephants
• Unusually great
• See 75D
• Steakhouse request
• Not at all well done
• Like a Bigfoot sighting
• Practically unheard-of
• Book collector's category
• Bloody, so to speak
• Like a collector's item
• Tough to get your hands on
• Barely done, as steak
• Pink inside
• Well-done's opposite, in the kitchen