Possible Clues:

• Source of some carbs
• 25-Down, informally
• Vegetable commonly found in Christmas pudding
• ''Baked'' side dish, slangily
• Idaho tuber, informally
• One with eyes for a cook?
• Maris piper turned up in South Dakota
• Something a potato may be called
• Fool perhaps trailing second jacketed type?
• Vegetable initially served before sweet