No cranberry sauce or mashed potatoes (sweet or otherwise). No pumpkin or apple pie and not necessarily turkey either. Did I mention eating with your hands? What kind of Thanksgiving is this? The first one. In 1621. At Plimouth Plantation.
In Mary Rowlandson's hugely popular captivity narrative from 1676, she describes her colony's struggles with the natives and how, when such a struggle was won, the town leaders held days of public thanksgiving.