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While the fish and macaroni are cooking, make the sauce. Melt the butter in a pan, stir in the flour and cook for a minute or two. Remove the pan from the heat and stir in the milk, salt, pepper, and mustard. Return the pan to the heat and bring to the boil, stirring all the time. When the sauce has thickened, lower the heat and add the Cheddar cheese, stirring until it melts.
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