In a shaker filled halfway with ice, combine the whiskey. lime juice, and simple syrup. Give it a few good shakes.
Fill a collins glass or highball glass halfway with ice, strain the cocktail over the ice. Use your choice of club soda, plain seltzer water, flavored seltzer or lemon lime soda to fill the glass.
Garnish with fresh rosemary sprigs and cranberries, if desired.
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Notes
This recipe originally called for Spiced Cranberry Syrup, but we all know I am a lazy bartender, so I started to swap it out for plain simple syrup and still find the cocktail delightful. If you do want to make this one extra special, use the spiced syrup recipe found here: Boil equal parts sugar, water, and cranberries. For every cup of water, add one cinnamon stick and one rosemary sprig. Sit overnight and then strain.