This recipe is a combination of my Dad's Candied Yam recipe and one from Gourmet. I prefer the darker sweet potato (which he called a yam) over the lighter yellow sweet potato. I like to use McClelland's Highland Scotch Whisky, but you can use any whisky/whiskey/bourbon you prefer; a friend told me she even made them with rum. I've also had good luck with making them in advance; arranging them in the dish, adding the syrup, and refrigerating them until it's time to bake them. This dish smells so good while baking: like cinnamon rolls, or the steam from a hot-buttered rum. And they taste almost like a dessert (I think they end up with a firm, custard-like consistency). At my family & friends' request, I now have to make them for every Thanksgiving and holiday meal.