Muddle 4-5 blackberries in the bottom of a cocktail shaker
Add ice to ¾ the way up the tin, pour in your lemon juice, gin and simple syrup
Shake vigorously for 30 seconds
Double strain into a rocks glass filled with fresh ice
Top with prosecco (option to sub club soda)
Garnish with fresh mint and a single blackberry
Cut a large swath of lemon peel and express the essential oils over the cocktail being sure to rim the glass before placing the peel in the drink and serving