MUDDLE thyme (strip leaves from stem) in base of shaker. Add other ingredients, SHAKE with ice and fine strain into ice-filled glass.
Lemon zest twist (expressed and discarded) & thyme sprig
Thyme and maple syrup add extra interest to a Whiskey Sour. Some may what to also add egg white.
Adapted from a recipe discovered at The Sea Fire Grill, New York City, USA.