Many of us know Mary McClintock as a writer who delights in good local food, celebrates the farmers who raise it, and brings us advice from the cooks who really know what to do with it. I know I have enjoyed her Wednesday food column, Savoring the Seasons, ever since it began  nearly four years ago. I’ve learned a lot about vegetables unknown to me including the gilfeather turnip. During her California youth McClintock probably didn’t spend any…