Onyx

1 12 oz Virgin Islands Rum, Cruzan Blackstrap
1 oz Amer Picon, Amer Boudreau
12 oz Balsamic Vinegar
14 oz Cherry syrup (syrup from brandied cherries)
Instructions
Stir; strain; one big rock.
History
Made for reddit's TiTu #7: Are You Afraid of the Dark?
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