Wash the blackberries well, dry them very gently and pour them into a bowl alternating them with the sugar.
Also add the alcohol inside the container, close the lid tightly (better if hermetically sealed) and let it macerate for at least 10-15 days, trying to remember to shake the jar at least once a day.
After the infusion time, filter and dilute with water. Then pour into the bottles and let it rest for at least 15 days.
That's all: the blackberry liqueur is ready, serve it very cold.
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