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Take the freshly washed and trimmed asparagus and add it to a large zip-close bag.
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Add the olive oil, salt, and pepper.
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Close and toss, making sure each piece is duly coated.
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Spread the asparagus onto a cooking rack in a baking sheet (or directly on the baking sheet) in a single layer.
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Sprinkle the zest of one lemon over the asparagus.
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Place the asparagus in a 400ยบ preheated oven.
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Cook the asparagus for 20-25 minutes, or until cooked but still crisp.
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Let cool for about 2 minutes and sprinkle freshly grated parmesan cheese over them and serve.