Mash fresh blackberries with sugar. Let sit for 15 minutes to allow fruits to expel juices.
Stir in vinegar. Cover and let steep in the fridge for 3 to 5 days, depending on your desired flavor profile. Strain out solids and keep in a jar. Store in the fridge until ready to use. Blackberry shrub syrup keeps in the fridge for a month.
Sparkling Blackberry Shrub: Add 1 oz blackberry shrub syrup to a serving glass filled with ice. Top with chilled sparkling water. Stir to combine. Enjoy immediately.
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