Ingredients:

10 oz. tomato puree
1/4 cup apple cider vinegar
1/4 cup + 2 Tbl molasses
2 cloves garlic, smashed and chopped
4 - 5 Chile de Arbol pods, de-stemmed, de-seeded,
and freshly ground
1/4 Tsp cumin seeds, freshly ground or 1/4 Tsp 
ground cumin from a jar
1/2 - 1 Tbl Worchestershire sauce
1 Tbl prepared yellow mustard
salt
black pepper

Preparation:

Combine the above ingredients, except salt andblack pepper, into a non-reactive sauce pan. Season to taste with salt and black pepper. Bringthe contents of the pan to a boil. Simmer at theloweset heat setting, stirring periodically forapproximately 20 minutes.