Muddle in a cocktail shaker 5 blueberries and about 3 mint leaves. Add bourbon, Cynar, creme de cacao and lemon juice to shaker and fill the vessel with ice. Shake vigorously until contents are properly chilled and diluted. Strain into an old-fashioned glass over fresh ice. Garnish with a lemon wheel and 2 or 3 blueberries on a skewer. *Cynar is an amaro, available at most liquor stores.