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Combine rice and water in a small saucepan.
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Bring to a boil, reduce heat to low, and simmer for about 15 minutes.
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Preheat oven to 400 degrees F (205C) Cut tops off peppers, seed insides, and arrange peppers in a large baking dish.
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Chop usable portion of the tops.
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Heat oil in a large skillet over medium heat.
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Brown ground beef in skillet.
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Stir in chopped peppers and onions in oil until soft.
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Add parsley.
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Reduce heat to low, and continue cooking for 5 minutes.
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Mix in cooked rice and 1 1/5 cups tomato sauce.
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Season to taste with salt and pepper.
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Spoon the mixture into the peppers, and top each with remaining tomato sauce.
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Cover, and bake about 45 minutes.
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Uncover, top each pepper with mozzarella cheese, and bake until cheese is melted.