Bloody Mary Steak Salad

Name: Bloody Mary Steak Salad
Ingredients: 1 1/2 pounds skirt steak (or hanger steak); 1 tablespoon Sherry vinegar; 1 tablespoon balsamic vinegar; Juice from 1 lemon; 2 tablespoons prepared horseradish; 1 tablespoon Worcestershire sauce; 1 1/2 teaspoons hot sauce; 1/4 cup chopped briny green olives, plus 2 tablespoons olive brine, divided; 1/2 red onion, thinly sliced; 1/2 cup celery half-moons, plus some leaves if you'd like; 2 tablespoons pickled jalapeños; 1 pint cherry tomatoes, halved; Freshly ground black pepper; 1/4 cup crumbled blue cheese; 1/2 cup parsley leaves