To make blueberry syrup, place sugar, water, blueberries, and mint in a small to medium saucepan.Bring mixture to a simmer. Mash down on the blueberries with fork or a potato masher.Simmer for 5 minutes. Let cool.
Set a fine-meshed strainer over a large liquid measuring cup or a bowl.Pour blueberry mixture into strainer. Press down on blueberries with the back of a spoon to get all the liquid out. Discard solids.Refrigerate blueberry syrup until needed.
To make sugared blueberries, place water and sugar in a small saucepan. Bring to a simmer. Stir until sugar is melted.Remove from heat and let cool 15 minutes. Then place blueberries in the liquid and leave them for 15 minutes.
Remove blueberries with as slotted spoon and palce on a paper towel. Let sit 1 hour and then sprinkle with sugar.
For each mint julep, place 3 mint leaves in a glass. Add about 2 ounces of blueberry syrup and muddle the mint leaves and syrup together.
Add about 2 1/2 ounces bourbon and then add ice to fill the glass.