Put the blackberries, lemon slice, and maple syrup in a cocktail shaker. Use a muddler (or the back of a spoon) to smash them together.
Fill the shaker halfway with ice cubes.
Pour in the lemon juice, bourbon, and add 2 drops of bitters.
Seal the shaker and shake it really well for about a minute.
You can strain the drink to get rid of any seeds if you want, using a cocktail strainer.
Serve the drink over ice in a glass. For an extra fancy touch, garnish with a lemon slice that's been slightly burned, a blackberry, and a little piece of basil.
Notes
You can also use 4oz of pre-made lemonade instead of lemon juice and syrup.
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