Preheat oven to 400 degrees F. Line a large baking sheet with a lip (like a jelly roll pan) with aluminum foil.
In a large bowl, mix the Brussels sprouts, olive oil, salt and pepper, until evenly coated. Pour them onto the prepared baking sheet and roast for 35 minutes, or until crisp on the outside.
Remove from oven and set aside. In small bowl, mix melted butter, syrup and ginger. Drizzle mixture over Brussels sprouts and return to oven for another 5 minutes. Serve immediately.