In a sturdy rocks glass or julep cup, combine 1 tablespoon (15 ml / 0.5 fl oz) of the sugar-free raspberry syrup and the fresh mint leaves. Gently muddle to release the mint's fragrant oils without shredding the leaves. 2.
Add the bourbon and the remaining 1 tablespoon (15 ml / 0.5 fl oz) of raspberry syrup to the glass. 3. Fill the glass completely with crushed ice and stir with a bar spoon for about 20 seconds, or until the outside of the glass becomes frosty. 4.
Garnish with a fresh mint sprig and a few raspberries, if desired.
Enjoy immediately!