Sunday Brunch: Broccolini Salad Recipe

Name: Sunday Brunch: Broccolini Salad Recipe
Ingredients: For the salad:; 2 pounds broccolini, tough ends discarded, stalks peeled; Kosher salt; 1 tablespoon sherry wine vinegar; 1 tablespoon red wine vinegar; 6 tablespoons extra virgin olive oil; Freshly ground black pepper; 3 large button mushrooms (about 2 inches in diameter), stems discarded, caps sliced thin; 1/2 small red onion, sliced thin, about 1/4 cup; 1 cup black olives, preferably salt-cured such as Cerignola, pitted; One (8-ounce) ball burrata cheese