Cut the bacon into small pieces and put into a medium sauce pan. Cook on medium heat until bacon is crisp. Remove bacon and set aside and wipe the grease out of the pan. Now add butter, and melt, once melted add Balsamic Vinegar, and Brown Sugar cook on medium heat until mixture gets thick and bubbly. In the meantime cook your brussel sprouts according to package directions. When done add the brussel sprouts, and bacon to sauce mixture and toss together until sprouts are well coated and serve.