The sweet potato is a versatile winter vegetable. Try it fried, mashed, baked, boiled, raw, candied, or salted. Whatever you do, just don't microwave it. This simple warm sweet potato salad, prepared with sheep's milk cheese and basil oil, can easily highlight some local ingredients. I scored a couple of white O'Henry sweet potatoes from Quail Cove Farms in Virginia, but any orange-fleshed variety will do. For the cheese, I recommend Colbere from Shepherds Manor Creamery, located in New Windsor, Md. It's a tangy, smooth, semi-hard cheese, and you can buy it at the 32nd Street Farmers Market all winter.