Sarah Josepha Hale was an amazing woman who pretty well invented the Thanksgiving holiday. I encourage you to read about her on Wikipedia.
This simple, attractive, and delicious version is superior to the familiar tinned variety in every way except convenience, and it's not so inconvenient to make, either.
The flavor is tart, sweet, rich, and complex. This is good enough to enjoy with many roasted or grilled meats at any time of year, and because it molds so well, it can ornament a fancy holiday table.