Possible Clues:

• Vegetable that can turn blue when cooked
• Colorful cole-slaw ingredient
• Cared about B&B taking time to provide part of meal?
• Left-leaning Tory group, say, turning up in a bit of a pickle?
• Traditional side dish for sauerbraten
• Vegetable greed -- madly purchasing one hundred and four Swedes?
• Braised vegetable in German cuisine
• Vegetable of the brassica family with purplish leaves
• Vegetable paired with apples
• Agreed BBC broadcast should include America's foremost vegetable