FROM LATE FALL to early spring, I never pass up sunchokes—root vegetables in the sunflower family that taste like nutty potatoes and have the texture of water chestnuts—when I see them. Choose tubers that are heavy and hard. I wash them, cut them into pieces with the skin on, and boil them with chicken stock, butter, salt and pepper to make a blended soup. It has a lot of umami. —Okan Kizilbayir, chef de cuisine, Salt, Amelia Island, Florida