INGREDIENTS
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Oil, for frying
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1 shallot, peeled and thinly sliced in rings
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1/4 cup unbleached all-purpose flour
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Kosher salt and freshly ground pepper
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1 1/2 pounds green beans
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12 slices bacon (3/4 pound), cut crosswise in 1/4-inch pieces
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2 tablespoons unsalted butter
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1 medium onion, cut into 1/4-inch dice (1 1/3 cups)
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8 ounces cremini mushrooms, thinly sliced
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3 cups milk, room temperature
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1/2 teaspoon Dijon mustard
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1/8 teaspoon cayenne pepper
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1 teaspoon Worcestershire sauce