Possible Clues:

• Pungent salad root
• Vegetable I'd pulled up with spots on the outside
• Salad ingredient consumed by undergrad is healthy
• Salad ingredient, mostly green on plate
• Impulsive, gobbling small girl’s vegetable
• Copper covered in spots — something he ate?
• Extremist cultivated his veg
• Root vegetable that's red on the outside and white on the inside
• Daikon, for example
• Root eaten raw