Meanwhile, heat oil in a medium saucepan over medium heat. Cook and stir the onions in oil for 5 minutes. Stir in water, tomato paste, vinegar, brown sugar, honey, and Worcestershire sauce. Season with 2 teaspoons salt, 1/4 teaspoon black pepper, liquid smoke, whiskey, garlic powder, paprika, onion powder, dark molasses, and 1/2 tablespoon ground chile pepper. Bring mixture to a boil, then reduce heat. Simmer for 1 1/4 hours, uncovered, or until sauce thickens. Remove from heat, and set sauce aside.
