North Carolina Pit Cooked Bar B Que

[tsubaki]

Over the years, we've only made probably 3-4 gallons and every time with varing results.
Usually about every third year we'll attempt making it again. The only time it tasted like vinegar was when we followed instructions (don't remember from where).
My great aunt made it from her vines, all she showed us to do was wash the grapes, add what amount sugar you wanted, fill with grapes, fill with water screw the lid on and bury.
The last time she did it she forgot where she buried the jar. Daddy found it about 2-3 years later, believe it or not it tasted like brandy.