• 1 1/2 ounces Bacardi Razz (white rum optional)
• 1 ounce simple syrup
• 1/2 lime , freshly squeezed
• 12 to 14 fresh mint leaves
• 4 raspberries
• 4 blackberries
• Sprig of mint

In a tall glass, lightly muddle the lime juice, 3 raspberries, 3 blackberries, simple syrup and mint leaves. The trick is to muddle just enough to release the oils from the mint leaves while leaving them intact. Add crushed ice and rum, and top with soda. Stir until the outside of the glass begins to frost. Garnish with the leftover berries speared with a mint sprig.