Preheat oven to 400ºF and line a baking dish with foil. Spread sprouts in a single layer and drizzle oil, enough to coat them; season with salt and freshly ground black pepper. Transfer to the preheated oven and cook for 25 minutes, tossing a couple times, until golden brown.
Meanwhile, in a large skillet over medium heat, cook bacon until crisped, about 8 minutes. Remove and place bacon on a plate lined with paper towel. Add onion to drippings (if there’s not enough, add clarified butter or vegetable oil) and sauté until soft about 5 minutes. Stir in brown sugar. Add roasted sprouts and bacon; pour in lemon juice. Stir once again until ingredients are well mixed and transfer to a serving dish. Makes 4 servings.