Run a lime wedge along rim of cocktail glass. Dip in sugar and lime zest to coat rim. Set aside.
In a cocktail shaker or tall glass, add blackberries, mint leaves, lime juice, and honey/agave. Muddle ingredients until blackberries are crushed and mint leaves have broken apart.
Add tequila to glass and stir to combine with muddled ingredients.
Add ice to prepared glass. Pour half cocktail mixture into glass, then top off with ginger beer.
Garnish with mint leaves and fresh blackberries. Serve and enjoy!
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