Ingredients

　　2 cups blackberries, frozen

　　1 1/2 cups raspberries, frozen

　　6 ounces light rum

　　4 ounces simple syrup

　　1 1/2 ounces fresh lime juice

　　2 cups ice

　　Optional garnish: Blackberries

　　Combine 2 cups blackberries, frozen + 1 1/2 cups raspberries, frozen + 6 ounces light rum + 4 ounces simple syrup + 1 1/2 ounces fresh lime juice + 2 cups ice. Optional garnish: Blackberries

　　Cooks' Note

　　Cook's Notes:

　　Head to the farmers' market for peak-season fruit. Freeze the fruit in a single layer on a parchment-lined baking sheet until solid. Purée ingredients in a blender until smooth and very thick. Divide among glasses and serve.

　　Cold Facts:

　　The drier the ice, the better. Melting ice makes for a watery cocktail.

　　No need to upgrade your blender. The old one will do the trick just fine.

　　Texture Matters:

　　Frozen drinks should look too thick when poured into the glass. They will loosen immediately.