How to Make It
Place potatoes in a medium saucepan, and cover with cold water by 1 inch. Add vinegar and 2 teaspoons of the salt. Bring to a boil over high. Reduce heat to medium, and cook until tender, about 20 minutes.
Drain potatoes, and transfer to a large bowl; cool completely, about 20 minutes. Add butter, honey, cinnamon, pepper, and remaining 1⁄2 teaspoon salt to potatoes. Beat with an electric mixer, or process in a mini food processor until smooth, about 45 seconds. Chill Whipped Sweet Potato Butter until ready to serve.