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1/4 pound blue d`Auvergne or other creamy blue cheese
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2/3 cup sour cream
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1/3 cup mayonnaise
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1 1/2 teaspoons Worcestershire sauce
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1 teaspoon kosher salt
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1 teaspoon freshly ground black pepper
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1 loaf health or 7-grain bread
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1 1/2 pounds rare fillet of beef, thinly sliced
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bunch arugula, or spinach
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kosher salt
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reshly ground black pepper
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2 tablespoons unsalted butter, at room temperature
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