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, steak sauce, Worcestershire sauce, molasses, mustard, celery seed and 1 teaspoon 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.
Photograph by Andrew Purcell
Recipe courtesy Food Network Magazine