Possible Clues:

• Small cabbagelike veggies
• Shoots around European capital for The Greens
• In Europe, Proust's novel cultivated around the plot
• In Belgium, Proust prepared head of state for the Greens
• Crucifer family members
• Green veggies despised by many (not me - try frying them in butter)
• Second vegetable course in a capital meal?
• Perhaps fare at Christmas, as EU delegates here, shoots up
• Right to stop EU talks — one may have a lot on one's plate today
• EU makes speeches about the end of irregular vegetables