Place the port, honey,brown sugar, lemon juice, and cinnamon in a small saucepan. Bring to boiling over medium heat, stirring to dissolve the sugar. Boil the glaze for 3 minutes, stirring from time to time.
Place the ham slices, slightly overlapping, in a baking dish and pour over the glaze.
Bake for 5 minutes, then baste the slices with the glaze and continue to cook for another 10 minutes or until the glaze is bubbling. Serve with root vegetable home fries or your favorite side.