Cauliflower Couscous with Cheesy Crumbs

Name: Cauliflower Couscous with Cheesy Crumbs
Ingredients: 2 heads of cauliflower (4 pounds), cut into 1-inch florets; 6 tablespoons extra-virgin olive oil; Kosher salt; Pepper; 1/2 cup panko; 1/4 cup finely grated Manchego cheese; 2 teaspoons finely chopped chives; 2 teaspoons finely chopped parsley, plus parsley leaves for garnish; 2 teaspoons minced shallot; 1/8 teaspoon minced garlic; 1/8 teaspoon finely grated lemon zest; 3 tablespoons extra-virgin olive oil; 1/2 tablespoon fresh lemon juice