You peel your pears—one per serving—leaving on the stem if the pear has one. Then place them snugly in a saucepan with just enough room to hold the pears in a single layer.
Pour over about half a bottle of red wine (or more, depending on the size of the pan and how many pears you have). Then add sugar, and a stick of cinnamon and some cloves, and if you like, some lemon or orange zest.
Allow the pears to simmer for about 20 minutes, turning them if need be so that they cook and color evenly, until they are quite tender but not falling apart.
Remove the pears onto a shallow serving bowl or plate, and continue to simmer the wine until has reduced into a syrupy consistency, then strain and pour over the pears. Allow the pears and their sauce to cool before serving.