1 ½ oz Mezcal
¾ oz Lime Juice
½ oz Grapefruit Juice
½ oz HipStirs Blackberry Mint Syrup

Combine all ingredients in tin, add a small amount of crushed ice, shake until the crushed ice is wholly absorbed into a cocktail, pour into a rocks glass, add crushed ice, and garnish with a salted grapefruit slice.