Blueberry Mojito

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In a food processor or blender, puree blueberries until smooth. Set aside.
In a large highball glass (16 oz), muddle together the simple syrup and mint leaves. (Muddling is a technique used to gently mash herbs and/or fruit to release the essence or juices. I recommend using a muddler for best results, however the back of a wooden spoon can be used in a pinch.)
Divide the muddled simple syrup and mint leaves between two highball glasses. In each glass, stir in 2 oz rum, 1 oz lime juice and 2 to 3 tablespoons of the blueberry puree, to taste.
Fill glass with ice and then top with club soda. Garnish with mint and blueberries, if desired.