INGREDIENTS
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1 1/2 lb. ground beef
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1/2 c. plain breadcrumbs
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1 large egg
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1 tbsp. Worcestershire sauce
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1 tbsp. yellow mustard
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2 cloves garlic, minced
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kosher salt
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Freshly ground black pepper
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3 tbsp. flour
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3 tbsp. butter
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kosher salt
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1 tbsp. Dijon mustard
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3/4 c. beer
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1 c. milk
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2 c. shredded Cheddar
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1 c. shredded mozzarella
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Pinch cayenne
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2 tbsp. chopped chives, plus more for serving
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12 pretzel buns