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To make the puree, blend the blackberries and water in a blender until smooth. Strain through a fine mesh strainer to remove seeds.
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To make the margaritas, combine the puree, lime juice, simple syrup, orange liqueur, and tequila in a pitcher.
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To rim the glasses, run a lime wedge around the rim of each glass and dip in salt. Add ice to each glass and pour margaritas over. Garnish with blackberries and limes.