Related Clues:

• Of value to collectors
• Beefsteak order, sometimes
• Like no-hitters
• Rarely encountered
• Inadequate
• Like a once-in-a-blue-moon event
• Pasta : al dente :: porterhouse : __
• Like one in a million
• Like some collectible coins
• Roast beef request, perhaps
• Hardly commonplace
• Not easy to come by
• Pink, say
• Still red inside
• Abnormal