In a bowl or pitcher, muddle the Blackberries (2 cup), Fresh Mint Leaves (12), and peel of the Lemon (1) together until the juice is gently extracted from the berries.
Add the Lemon Juice (1/4 cup), Brown Sugar Simple Syrup (1/4 cup), and Bourbon (4 fluid ounce) whiskey to the blackberry mixture. Stir to combine.
Add ice to 4 glasses. Place a small strainer over each glass, then carefully pour even amounts of the tasty cocktail into each glass. If you like some pulp in your drink, feel free to add some to each glass.
Garnish with the whole blackberries, Lemon (to taste) and Fresh Mint (to taste), if desired. Serve and enjoy!