The traditional American Thanksgiving menu reads like a compendium of a Maryland farmers’ market: potatoes, corn, squash, sweet potatoes, pumpkins, apples and turkey. The high-bush cranberry also grows here, and if you want to make your own cranberry sauce, the sour little berries can likely be harvested right from a neighbor’s ornamental garden.     For my mother, who grew up on a South Dakota farm, perfecting Thanksgiving Dinner in Maryland meant adding some...