Grilled Beef Salad

Name: Grilled Beef Salad
Ingredients: One 2-pound top round London broil; 2 tablespoons extra-virgin olive oil; 1 tablespoon whole-grain mustard; 4 cloves garlic, crushed; 2 sprigs fresh thyme; 1 tablespoon kosher salt; 2 teaspoons lemon pepper; 1/4 cup extra-virgin olive oil; 1 teaspoon fresh thyme leaves; Juice of 1 lemon; Kosher salt and freshly ground black pepper; 1 to 2 tablespoons heavy cream; One 5-ounce container blue cheese crumbles; 4 cups spinach leaves; 2 cups torn romaine leaves; 2 cups torn salad greens; 1 pint cherry tomatoes, halved; 2 scallions, sliced; 1 red bell pepper, very thinly sliced; 1 small red onion, very thinly sliced