0 Add blackberries, mint leaves, and lemon juice to the bottom of a cocktail shaker. Use a muddler to smash the fruit and leaves.
1 Add bourbon and syrup to the smashed blackberry mixture.
2 Add a handful of ice cubes to the shaker and firmly place the lid on. Shake for 30 seconds to combine the cocktail ingredients and chill them.
3 Use a mesh strainer to strain the cocktail into a glass over ice. Top with blackberry seltzer.
4 Garnish with blackberries on a food pick and mint leaves.
