Combine water, sugar and mint leaves in a small saucepan. Bring to a boil over high heat and swirl the pot until the sugar is dissolved. Allow syrup to cool, approximately 1 hour. Remove mint leaves. Refrigerate until ready to use.

To serve, fill eight cups with crushed ice and pour 4 ounces of bourbon and 1/4 cup mint syrup in each. Garnish with mint sprigs