Fresh Chocolate-Mint Chocolate Chip Ice by Alice Q. Foodie adapted from this recipe http://www.npr.org/templates/story/story.php?storyId=5531244 and this one. http://orangette.blogspot.com/2007/05/safe-to-proceed.html
I bought mine (peppermint oil) at Henry's - it's an essential oil, which they carry in the cosmetics section. I'm pretty sure you can also buy it at Whole Foods.
Makes 1 quart, plus one extra serving for the cook!