Step 1

In a heavy skillet or dutch oven over medium, cook bacon until crispy. Using a slotted spoon, move the cooked bacon to paper towels to drain.   Tilt the pan to one side and carefully ladle off all but 2 tablespoons of the bacon grease.  Add the onions and salt; cook over low heat until browned and slightly caramelized. Add the garlic and cook for an additional 1 minute. Tilt the pan and remove all but 1/2  tablespoon of excess grease.

Step 2

Stir in the cooked bacon, brown sugar, cider vinegar, black pepper, cayenne pepper, and cumin, and prepared strong black coffee. Let the mixture cook down until slightly thickened and browned; 20-25 minutes.  Remove from heat and stir in the balsamic vinegar. Serve warm over crusty French bread or crostini.