Pork Tenderloin With Fruit with butter

1 lb pork tenderloin 1/4 teaspoon salt 1/4 teaspoon ground black pepper 2 tablespoons vegetable oil 2 large shallots , finely chopped 8 ounces cremini[...]

1 tablespoon butter 1 small onion , finely chopped 1 tablespoon flour 1 cup chicken stock 2 tablespoons Dijon mustard 2 tablespoons pure maple syrup 1[...]