"Margaret Bragg does not own a single cookbook. She measures in "dabs" and "smidgens" and "tads" and "you know, hon, just some." She cannot be pinned down on how long to bake corn bread ("about 15 to 20 minutes, depending on the mysteries of your oven"). Her notion of farm-to-table is a flatbed truck. But she can tell you the secrets to perfect mashed potatoes, corn pudding, redeye gravy, pinto beans and hambone, stewed cabbage, short ribs, chicken...