Place the blackberries and sugar in a large glass mason jar. Using a muddler, smash the sugar and blackberries together until sugar has dissolved.

Pour in the brandy and tightly close, giving it a few quick shakes.

Let the mixture steep and infuse for 2 weeks, shaking every 2-3 days.

Strain the brandy through a fine mesh sieve or cheesecloth.

Transfer the brandy to another clean mason jar to store.

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