Possible Clues:

• Plant (onion relative) eaten as a vegetable
• Release unauthorised information on radio -- one of five a day?
• Vegetable that is emblematic of Wales
• Staple of Turkish cuisine
• National symbol that's improperly disclosed, we hear
• __ and potato soup
• These tiny onions are delicious I can't even hate them
• Ship about to become a national symbol
• Vegetable lasagne starter -- yikes!
• Stew vegetable