Wash apple(s) and core. Place right side up in a medium sized baking dish. Alternately layer the sugar and Grape Nuts in the core of each apple until the core is full to slightly overflowing. Sprinkle 2 teaspoons or so of water on each apple and a little on the bottom of the baking dish. Sprinkle with cinnamon to taste. Bake at 350 degrees until apples are soft or for 45-50 minutes. Serve warm or cold with fatfree half n half, if available.