Here's what you'll need to make one cocktail:
- 2 oz bourbon whiskey
- 6-8 fresh blackberries
- 1/2 oz simple syrup
- 1/2 oz fresh lemon juice
- Ice
- Club soda
- Mint sprig and blackberry for garnish
Use a good quality bourbon for the best flavor. You can adjust the simple syrup to make it sweeter or less sweet.