The Best Barbecue Sauce

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2 tablespoons vegetable oil

1 medium onion, chopped (about 1 cup)  

2 cloves garlic, smashed

3 cups ketchup

1/2 cup apple cider vinegar

1/4 cup packed dark brown sugar

1/4 cup steak sauce

1/4 cup Worcestershire sauce

3 tablespoons molasses

3 tablespoons yellow mustard

1/2 teaspoon ground celery seed

Kosher salt

1 to 2 teaspoons liquid smoke, optional