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Add butter to a saucepan over medium heat, and cook until the butter begins to foam and bubble. Add the flour and stir for about 1 minute. Slowly pour in the milk, whisking continuously until all the milk has been incorporated and the sauce begins to thicken. Make sure that there are no lumps in the sauce. Pass the sauce through a fine sieve if needed. This process should take 5 to 7 minutes.
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Remove the pan from the heat and add the cheese, mixing until it has completely melted. Add the fresh herbs and truffle oil. Season to taste, with salt and pepper. Add the cooked and still warm pasta to the cheese sauce. Divide evenly among 4 bowls and shave the black truffle over the pasta, if desired. Serve immediately.
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