In a medium sauce pan, combine water, distilled white vinegar, apple cider vinegar, juice from 1 lemon, and Worcestershire sauce. Then add dark brown sugar and molasses and ensure they're dissolved and combined.
Add tomato paste and similarly ensure it's well combined.
In a separate bowl combine 2 tbsp of cornstarch and 1/2 tbsp of water. Once combined, add to sauce.
Add remaining dry ingredients and whisk until well combined.
Set your burner to medium heat and get your sauce to a slight boil. Whisk the sauce intermittently.
Once the sauce reaches a slight boil, lower the burner to low/simmer. Allow the sauce to simmer for 20 minutes or until your desired consistency. Note: This sauce is supposed to be slightly thin.
Once at your consistency, take off the heat and allow to cool.
Once cooled, transfer to a mason jar or similar container.
You can enjoy from there or refrigerate for 1-2 weeks.
Notes
If you want some smoke flavor, add 1/2 tablespoon of liquid smoke.