This is the same recipe we use! So delicious! You can also make it with rum or gin. We add the vodka all at once and let it freeze 48 hours. but I'll have to try it this way too.
My sister and I made this years ago when we were in our 20's. I'd lost the recipe but so glad I found it here. This is very refreshing without the sharp taste of alcohol. Thanks for posting it. I'm adding it to my Cocktail Cookbook. :)