Charred Broccoli and Cauliflower Salad

Name: Charred Broccoli and Cauliflower Salad
Ingredients: 1 medium crown broccoli, broken into large florets; 1 medium cauliflower, broken into large florets; 3 tablespoons olive oil; 1 teaspoon kosher salt; 1/2 teaspoon freshly ground black pepper; 1 cup arugula; 1/2 cup dried blueberries, plus extra for garnish; 1/4 cup pickled red onions, plus extra for garnish; 2 tablespoons sunflower seeds, plus extra for garnish; 2/3 cup mayonnaise; 1/3 cup Greek yogurt; 2 tablespoons chopped fresh dill; 2 tablespoons chopped fresh parsley; Zest and juice of 1 lemon; Pinch kosher salt; Pinch freshly ground black pepper