• If you want to make the optional blackberry topping, simmer sugar and water together in a small pot. Simmer for a few minutes and then remove from heat and add in blackberries. Stir to combine and let sit for 10 seconds.
• Drain syrup off blackberries and toss them with sugar until it coats the berries.
• Lay out the blackberries on a piece of parchment paper to dry.

To make a cocktail:

• Add blackberries, mint, sugar, and lemon to a pint glass and muddle well to combine flavors.
• Add bourbon and fill with ice. Shake well to chill and mix.
• Strain mixture into a cocktail glass with fresh ice and top with ginger beer. Garnish with candied blackberries.