"A friend of mine, Elizabeth, gave this to me a few years back... another I keep meaning to try!..."
INGREDIENTS
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1 1/2 lbs lean ground beef, browned and drained
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2 medium onions, chopped
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11 ounces rigatoni pasta, cooked and drained
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28 ounces prepared pizza sauce
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2 lbs shredded mozzarella cheese
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3 ounces pepperoni, sliced
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mushroom, to taste