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
