2 (10-ounce) filet mignon
2 tablespoons vegetable oil
1 tablespoon fleur de sel
1 tablespoon coarsely cracked black peppercorns
2 tablespoons unsalted butter, at room temperature, optional

Roquefort Chive Sauce, recipe follows
1 1/2 cups heavy cream
2 ounces French Roquefort cheese, crumbled (4 ounces with rind)
1/2 teaspoon kosher salt
1/4 teaspoon freshly ground black pepper
1 tablespoon chopped fresh chives