Fill a shaker with ice and add all the ingredients but the twist. Shake until frothy and cold, then strain into a rocks glass over fresh ice. Garnish with the twist.
About this recipe
*Note: If you are not feeling kitchen crafty, whey can be purchased at Hawthorne Valley Farm Store in Ghent, among other places in the Hudson Valley, and may be easily procured from a local dairy, if asked nicely. Fresh whey can usually be kept a week in the fridge and about three months in the freezer.