If you are like my family and I, well alcohol and BBQ's go hand in hand! So why not add it to the food as well!
This recipe is not an official or unofficial recipe of any of Jack Daniel's BBQ sauces they already sell. This is just my own homemade creation inspired by Jack Daniel's Whiskey and delicious BBQ!

Step 1: Ingredients!

You will need:
1/4 Cup Finely Chopped Yellow Onion
2 Tablespoons Minced Garlic
2 Tablespoons Butter
1 Cup Ketchup
1 Tablespoon Ground Mustard
2 Tablespoons Brown Sugar
1 Tablespoon Paprika
1 Tablespoon Chili Powder
2 Teaspoons Thyme
1 Teaspoon Salt
1 Teaspoon Pepper
Cayenne*** - 1 Teaspoon for Hot Sauce, 1/2 Teaspoon for Medium Sauce, 0 Teaspoons for Mild Sauce!
2 Tablespoons Molasses
1 Tablespoon Worcestershire Sauce
1 Cup Apple Cider Vinegar
1/4 Cup Water
1/4 Cup Jack Daniel's Whiskey, Plus an optional extra 1/2 Tablespoon.

Recipe Yield: About 2 1/2 Cups of BBQ Sauce
Note: The sauce shown in this Instructables used both the full Teaspoon of Cayenne and the extra 1/2 Tablespoon of Whiskey.

Tools:
Knife
Cutting Board
Sauce Pan
Measuring Cups and Spoons
Mixing Spoon or Rubber Spatula
Stove
Container for Storage or Serving

Step 2: Dice the Onion!

Grab your knife and cutting board and finely chop a portion of your yellow onion. Only 1/4 cup needed.
Also mince your garlic cloves if you didn't buy any pre-minced garlic. Only 2 Tablespoons needed.

Step 3: Sweat the Onion/Garlic!

In a Medium sauce pan, combine the butter, garlic, and onion. Put on med-high heat and saute the onions and garlic for a few minutes until they begin to get tender and lightly golden.

Step 4: Add Ketchup!

With the onions and garlic sauteed, add the ketchup to the saucepan and reduce heat to a simmer on low heat.

Step 5: Add Spice!

Add the rest of the dry ingredients/spices and stir.

Step 6: Add Liquids!

Lastly, add all the remaining ingredients/liquids to the saucepan with the exception of that optional 1/2 Tablespoon of Jack Daniel's Whiskey, save that for later. Mix well.

Step 7: Simmer!

Simmer and reduce the BBQ sauce for 30 minutes. It should have thickened, and resembles a yummy BBQ sauce now. Take the saucepan off the heat. If you would like a more prominent Jack Daniel's flavor to show through than what is already in the sauce, here is where you would stir in the extra 1/2 Tablespoon of Jack Daniel's Whiskey if you choose to.

Step 8: Finished!

Let the sauce chill and you're finished! Store it in an airtight container for later or get to grilling with it right away. Enjoy!

EDIT: There was a good question in the comments about the shelf life of this sauce. Just to repeat it where it is easier to see:
Refrigerated, I've kept it up to a month in an airtight container. By then it is gone. So I don't know how much longer it lasts refrigerated past that. As for long term, I have made bulk batches. I've kept it frozen as long as 4 months and it hadn't gone bad. Beyond that I'm not sure either. Just make sure to give it plenty of time ahead to thaw, preferably sitting in the fridge and not at room temp.
If you do attempt it past these tested time frames you can let me know how it went!

Thanks for all the favorites and comments!