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Bend asparagus spears gently to snap off tough end.
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Cut tender parts into 1" pieces.
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Wash under cold running water.
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Shake off excess water and place in microwaveable container.
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Microwave on HI for 3 minutes (alternately, cook in boiling water for 3 minutes).
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Drain and rinse under cold water, drain again.
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Set aside 1 1/2 cups asparagus tips.
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In saucepan, melt butter over medium heat.
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Gradually whisk in flour and cook, stirring constantly, for 1 minute.
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Whisk in milk and stirring constantly, cook for 10 minutes or until thickened.
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Remove from heat.
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Stir in cream cheese, lemon rind, lemon juice, salt, pepper and nutmeg until cheese is melted.
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Meanwhile, cook noodles in boiling water until tender (about 10 minutes).
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Place 3 noodles in a 13x9 baking dish.
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Spread with one cup sauce, then 1/4 of the asparagus (not including reserved tips), then 1/4 of the mozzarella.
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Repeat layers 3 more times then top with final layer of noodles and sauce.
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Sprinkle with Parmesan cheese.
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Bake in preheated 375 degree oven for 35-40 minutes or until bubbling and golden.
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Sprinkle reserved asparagus tips over top.
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Bake for an additional 5 minutes.
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Let sit for 10 minutes before serving.