Ah Mackinac Island, a Michigan tourism paradise known for its horse-drawn carriages, lilacs, the Grand Hotel [scene of the movie "Somewhere In Time"] and, oh yes, fudge. Wander through the streets and about every 3rd or 4th shop you pass will be a fudge shop, and you'll usually be able to watch the freshly boiled up fudge being spread and cooled on a marble slab. It's strangely addicting watching this process, and if you hang around awhile you'll get a sample eventually. This recipe purports to be an authentic version, though no particular fudge shop was mentioned as owning the recipe. The initial recipe is for a vanilla fudge. Chocolate fudge and peanut butter fudge variations follow, so read through the entire recipe if you want to make either of those flavors.