I have been using my Vitamix to make sorbet...I just toss in some fruit (today I did a peach and some blueberries) and ice and some stevia to sweeten. Vitamix purees and freezes it into sorbet in 30 seconds. I have been mixing in a tablespoon or so of heavy cream afterwards. The stevia has worked fine...however, I don't want my sorbet as sweet as most would want their ice cream. I think if you added a whole lot you'd ruin the whole batch. But if you are using fruit, perhaps the natural sweetness will allow you to add less. Happy tinkering!

--Cindy