This is one of the simplest versions of this wonderful dessert which requires no cooking, just a little time and patience which will, I promise, be amply rewarded. I recommend using really good quality store-bought ice cream but, if you wish, you can reduce the calories and fat by using frozen yogurt. But you don't eat this every day, so go for it, whipped cream and all. Just make sure the bowl you use will fit into your freezer. Almost all the time is freezing time.