You can cook the spaghetti squash a couple of ways. To save on time, bring a large amount (enough to cover the squash) of water to a boil. Gently lower in the spaghetti squash and cook for about 30 minutes or until a fork goes easily into the flesh. Remove from the water and let it cool.
Or you can bake the squash. To do so, preheat the oven to 350 degrees. Set the squash on a baking sheet and prick it with a pot fork or slender long knife so the skin doesn't burst. Bake anywhere from 45 minutes to 1 1/2 hours, depending upon its size. Let cool a bit.
Either way you cook the squash, split it down the middle and remove the seeds. With a fork rub the squash flesh until it separates into spaghettilike strands. To serve it simply, reheat it in olive oil or butter, season with salt and pepper and fold in grated cheese or serve it more as a main course with more ample toppings. Garnish with olives.