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To a food processor, add the blackberries, lemon juice, sugar.
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Puree until it is a thick sauce.
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Slowly add the water through the oil/liquid dispenser, quarter cup at a time, until it reaches the desired consistency.
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Once the liquid has been incorporated, press the sauce through an fine mesh sieve to remove the seeds.
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Freeze for up to 2 months or use within 3 days.