Eaten in Eagle Tavern at The Henry Ford Greenfield Village (MI) ?
I work across the street from the Henry Ford. The Eagle Tavern is really good...historically accurate food made from locally produced products. It's not amusement park food at all, It is the best restaurant in Greenfield Village/ Henry Ford museum complex. It's not to be missed, in my book. Hope I caught you in time for your trip! The other two choices are Taste of History and Michigan Cafe, which are cafeteria style food that's relatively tasty for cafeteria food, but it's still a cafeteria.
The Eagle Tavern menu is supposed to be authentic to the era of the building; as much as possible they try to have only food and beverages that were available in the mid-19th century, so as to reproduce the experience of a traveler of the time (and with the servers in costume and in character). It's not the kind of thing that appeals to everybody, so if you're just looking for a simple meal, you might do better outside the park.
I joined a small group for their Thanksgiving dinner/feast/special ~10 years ago. The food
must've been okay ... as I have no strong memories good-or-bad.
They do the period clothing/dress schtik ... not my thing; but I was willing to participate as
it was something our monthly dinner-group outing.