Knocked this sauce up today for some lovely fat 1/2 kg (bit over a pound) dry aged t-bones I am going to throw over the coals.

12 chipotle chillis - halved and seeded
2 cloves garlic diced
1/2 white onion sliced
1 bay leave
1tsp salt
1tsp cracked pepper
6tbsp ketchup
2 cups bourbon (i used JD cos it wasnt getting drunk fast enough)
1 cup water
1/3 cup apple cider vinegar

Throw all the above in a covered shalllow pan and simmer for an hour, you want the liquid to reduce back to about one cup, discard bay leaf and run the mix through a blender/processor/hand mixer untill it reaches your desired consistency, I like mine velvety and even added a knob of butter to give it a nice gloss.
Sauce done, now a few beers before getting the coals going.