Marinated Steak Salad

Name: Marinated Steak Salad
Ingredients: 1 medium shallot, minced; 1/2 teaspoon minced fresh rosemary; Salt and freshly ground pepper; 3 tablespoons sherry wine vinegar; 2 tablespoons Dijon mustard; 1/4 cup walnut oil; 1/4 cup plus 1 tablespoon vegetable oil; Four 1-inch-thick boneless steaks (about 7 ounces each); 1/2 cup coarsely chopped walnuts; 2 Belgian endives, cut crosswise into 1-inch pieces; 1 pound escarole, torn into bite-size pieces; 4 ounces Roquefort cheese, crumbled (about 1 cup)