While the butter is melting, place your over the flame to get a char all around the pepper. About 2 minutes.
Add brown sugar and bring to a boil for about 5 minutes
While the butter and sugar mix is boiling, de-seed(optional) your jalapeno and place in a blender
Blend the jalapeno into the tomato sauce until no large chunks are visible.
Add in tomato sauce mixture, vinegar, Worcestershire sauce, garlic powder, onion powder, cumin, ground mustard, salt and ground cayenne pepper into the pot of the butter sugar mix and stir.
Simmer for about 30 minutes to thicken up, stirring occasionally.
Optionally, you can blend the sauce mix to thin it up a little, which will make it easier to pour through a bottle.
Serve on the side, or on top of your favorite barbecue dish and enjoy!