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Meanwhile, melt butter in heavy medium saucepan over medium-low heat until foam subsides, then whisk in flour and cook, whisking, 1 minute. Whisk in milk, mustard, and ¼ teaspoon pepper and bring to a boil over medium heat, whisking. Simmer, whisking, 2 minutes, then add beer and simmer, whisking, 1 minute. Remove from heat and whisk in cheese melted.
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