In a small saucepan over medium-high heat bring the sugar and water to a boil. Once boiling stir in the mint leaves and reduce the heat to a simmer. Once the sugar has dissolved remove from the heat and cool. Store in the refrigerator for up to a month.

In a low ball or old fashioned glass add the berries, mint leaves and mint simple syrup. Use a muddler or end of a wooden spoon to mash the berries and release the oils from the mint. Add in the bourbon and either crushed or cubed ice. Stir well and garnish with a sprig of mint and extra berries.