The Porto Old Fashioned is a sophisticated and timeless cocktail that combines the flavors of Porto wine, sugar, and bitters. It is made by muddling a sugar cube with a few dashes of bitters in a glass, then adding Porto wine and ice. The mixture is stirred gently and garnished with an orange twist. The Porto Old Fashioned has a rich and complex flavor, with the sweetness of the Porto wine balancing out the bitterness of the bitters. It is a perfect choice for a cozy evening by the fireplace.