I've had this particular type of fudge many times since I was a kid, but I had no idea it was called "Penuche Fudge."
According to Wikipedia, it's a New England fudge (and parts of the south) made with butter, milk, brown sugar, and vanilla, and tastes a lot like caramel. It's lighter than regular fudge.
Here's a recipe from recipezaar.com made with walnuts, and here's one from AllRecipes made with pecans.













