Possible Clues:

• Not ready to serve
• Such a steak is rarely served
• Awfully red on being found in nude, unexpectedly in raw!
• Not cooked enough
• Inadequately cooked
• Pink, turning red, on dune
• Too rare
• Where Oxford students learn English that's half-baked?
• Working for lecturer the ultimate in pleasure? That could be rare
• It's rare to have so performed not enough