Preheat oven to 400 degrees F. Arrange butternut squash, Brussels sprouts, and onion on a baking sheet. Drizzle with olive oil and balsamic vinegar and toss. Season with pepper. Roast in oven for 30 to 35 minutes, or until browned. Remove from oven and add to a serving dish. Sprinkle with pomegranate seeds and serve immediately.
*Nutritional information is an estimate. Please consult a doctor or nutritionist for the most accurate nutritional info.