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Bring a large pot of salted water to a boil.
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Add fettucine pasta and cook for 8 to 10 minutes or until al dente and drain Melt butter in a large skillet and add chopped garlic.
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Cook on low for about 5 minutes, stirring often, making sure not to burn the garlic Pour about 1/4 cup of the heavy cream into a small bow.
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Add the egg yolk and beat together and put aside.
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Pour the remaining cream into the frying pan.
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Increase the heat to medium-high.
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As the cream starts to boil, mix rapidly using a whisk.
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Slowly add the cream/egg mixture.
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You do not want the egg to cook.
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Continue beating the cream mixture until all mixed together.
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Add 1 cup of Parmesan cheese and continue to mix the cream.
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Pour in remaining Parmesan and parsley and mix until smooth.
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Immediately remove from stove.
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Serve over cooked pasta.