Plant a White Turnip in Sunsong Ranch. You can purchase seeds from Merchant Greenfield in the Halfhill Market.
Grandpa often told me to "Keep my drawers clean and my dirt cleaner." It sounds like a joke, but he makes a good point.
Vegetables tend to leave behind bits of root that can contaminate your soil... but a nice, big, white turnip will clean that gunk right up. Think you could plant a white turnip for me?