Preheat oven to 400 degrees. Cut off the brown ends of the brussel sprouts and remove any of the yellow outer leaves. Cut the brussel sprouts in half and put in a large bowl. Add the olive oil, salt and pepper. Mix together will to coat everything. Pour onto a sheet pan and roast for 35-40 minutes until the sprouts are crisp on the outside and tender inside. Shake the pan every once in awhile so they brown evenly. Sprinkle with a bit more salt when they're done and serve immediately.