This recipe was found on the net and posted per a recipe request. Original poster is MacKenzie.
In a large stock pot heat oil over medium heat.
Add onions and saute for 5 minutes, stirring frequently.
Add remaining ingredients except vinegar and bring to a boil.
Reduce to a simmer, simmering for 45 minutes.
Add vinegar and continue to simmer until reduced to 1 cup, around 1 hour.
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