Step 1

Place the blackberries and lime zest in a sealable glass jar, muddle lightly to release juice, and then add brandy and vodka. Seal and shake. Let mixture steep for 3 days at room temperature away from direct sunlight. Strain through a fine mesh strainer, pressing down to extract juice, then filter mixture through a coffee filter or through two layers of cheesecloth. Discard solids.

Step 2

Combine blackberry infusion and simple syrup in a sealable bottle or jar, then shake to mix. Let rest for a minimum of one day. Store in the refrigerator for up to two months.