In a small saucepan, bring the water, sugar and mint to a boil. Remove from the heat. Let cool completely.
Filter the mint syrup. Keep in an airtight container in the refrigerator.
In a glass, combine the bourbon and ½ oz (15 ml) of the mint syrup (see note). Generously fill the glass with crushed ice. Garnish with the mint sprig and dust with icing sugar, if desired. Serve with a straw.
The syrup will keep for about 3 weeks in the refrigerator.
Recipes with the "Healthy Pick" stamp have been evaluated by a registered dietitian member of the Ordre professionnel des diététistes du Québec.