Fillet of Beef Sandwiches

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1/4 pound blue d'Auvergne or other creamy blue cheese

2/3 cup sour cream

1/3 cup mayonnaise

1 1/2 teaspoons Worcestershire sauce

1 teaspoon kosher salt

1 teaspoon freshly ground black pepper

To assemble:

1 loaf health or 7-grain bread

1 1/2 pounds rare fillet of beef thinly sliced, recipe follows

1 bunch arugula

Kosher salt

Freshly ground black pepper

2 tablespoons unsalted butter, at room temperature

Fillet of Beef:

1 1/2 pounds whole fillet of beef trimmed and tied

2 tablespoons melted butter

1 tablespoon salt

1 tablespoon coarsely ground black pepper