INGREDIENTS
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1 (16 ounce) package processed cheese spread, cubed
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1 bunch chopped scallions, tops reserved
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3/4 cup good-quality beer, preferably Killian’s Irish Red
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1 tablespoon Dijon mustard
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4 ounces extra sharp white cheddar, grated
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2 tablespoons cornstarch
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Kosher salt and ground black pepper
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Milk for thinning (optional)
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Toasted pretzel bread, for serving