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After draining the pasta, return the pan to medium heat. Add saved pasta water to oil and boil until reduced by ⅓.
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Stir cooked spaghetti into sauce till coated and cooked to your taste. After turning off the heat, add parmesan and parsley. Try again to mix.
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Let the pasta soak up the sauce for two minutes before serving. Add additional parmesan and red pepper flakes if desired.
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