In a rocks glass muddle the strawberries and sugar together, fill the glass with crushed ice.
In a large cocktail shaker, add the torn mint leaves, bourbon, grenadine (optional), lemon juice and balsamic. Fill the shaker with ice. Shake well and strain into a rocks glass. Garnish with fresh mint sprigs. Enjoy!
From Chasing Seasons
https://www.chasingtheseasons.com/strawberry-bourbon-smash/