Slice bacon into 1-inch pieces and cook until done but not quite crispy. Remove all but about 2 TBS of the bacon grease from the pan.
Chop bacon into pieces that are 1/4 inch or less.
Dice onion, mince garlic.
Sauté onion, garlic and red pepper flakes in the 2 TBS of bacon grease that we left in the pan over medium high heat until onions are caramelized and soft.
Add bacon, brown sugar, Jeff's original rub, maple syrup, brewed coffee, apple cider vinegar and Jeff's barbecue sauce to pan with sautéed onions and garlic and combine well.
Simmer mixture over low heat until liquid is reduced and a spoon dragged through the mixture takes a few seconds to come back together.