Possible Clues:

• Cooked rib to pass round upstanding company, then pass vegetable
• Vegetable British love cold, leading to endless stomach ache
• Variety of cabbage, green heads
• Vegetable with tightly packed green heads
• Sort of green cauli
• Green vegetable - producer of Bond films
• Vegetable, about one pound, Fidelio's jailer's eaten
• May be purple for the Greens
• Veg for a film producer
• Good source of potassium