How can you go wrong with roasted veggies and bacon?
Preheat oven to 425 degrees. Spread bacon out on a large baking sheet (rimmed to trap the grease). Bake 10 minutes, until browned. Add Brussels sprouts and sprinkle with salt and pepper. Roast until they begin to brown (another 15 minutes). Remove pan from oven, and toss in the apple.
Return to oven, roasting for 10-15 minutes until Brussels sprouts are tender and the apple has softened.
Gently toss the finished vegetables in vinegar and serve immediately.