This Pear Sauce recipe is based on a recipe mentioned in Pliny the Elder's Natural History Book 15, Chapter 17. For a more authentic taste, use Muscat of Samos Greek Sweet wine. Kourtaki is a good brand of this wine, available in Total Wine and other wine stores in the US.
Although in Grant's book it is described as Pear Jelly, when I made it, it was liquidy, more like Pear Sauce. Note that the alcohol from the wine does not cook off, so this sauce is intoxicating if you eat too much.