Muddle 6 blackberries and 6 mint leaves in a Boston Shaker with ¼ part simple syrup. In the mixing glass, combine Basil Hayden's Bourbon, lemon juice and remaining simple syrup and add to the muddled blackberries and mint leaves. Add ice and shake. Double strain into a Collins glass with fresh crushed ice. Top with sparkling wine. Garnish with a skewered mint leaf and blackberry.