From Food Network, episode "The Case for Butter". Although the herbs might change, the technique is the reason for posting this recipe. I have had varying luck with flavored butters. Often, they separate during whipping giving a pretty unappealing appearance to the dish. Not knowing if I was whipping it too long or not long enough, I turned to the "expert". So, 5-7 minutes of beating? Glad I have a stand mixer.