2 tablespoons vegetable
oil
1 cup chopped onion
2 cloves garlic, smashed
3 cups ketchup
1/2 cup apple cider vinegar
1/4 cup packed dark brown sugar
1/4 cup Worcestershire sauce
3 tablespoons molasses
3 tablespoons yellow mustard
1/2 teaspoon ground celery seed
1 teaspoon Kosher salt
1 teaspoons liquid smoke
Heat the vegetable oil in
a medium pot over medium heat.
Add the onion and garlic and cook until the onion is
golden, 6 to 7 minutes.
Stir in the ketchup, 1 cup water, the vinegar, brown
sugar, Worcestershire sauce, molasses, mustard, celery
seed and salt.
Bring to a boil, then reduce the heat to medium low and
simmer until the onion is tender, about 15 minutes.
Stir in the liquid smoke.
Strain the sauce, pressing on the solids to extract any
liquid.
Keep refrigerated
