Preparation Put oven rack in middle position and preheat oven to 450°F. Lightly oil a 9-inch pie plate or square baking dish. Core cauliflower, leaving head intact, then discard core and put cauliflower head in pan. Drizzle 2 tablespoons olive oil over top of cauliflower and sprinkle with 1/2 teaspoon salt. Bake until tender, 1 to 1 1/4 hours. Transfer to a serving dish. Whisk together lemon juice, capers, pepper, and remaining 1/2 teaspoon salt in a small bowl, then whisk in remaining 1/4 cup oil. Surround cauliflower with parsley sprigs and drizzle cauliflower and parsley with dressing.
Preparation Put oven rack in middle position and preheat oven to 450°F. Lightly oil a 9-inch pie plate or square baking dish. Core cauliflower, leaving head intact, then discard core and put cauliflower head in pan. Drizzle 2 tablespoons olive oil over top of cauliflower and sprinkle with 1/2 teaspoon salt. Bake until tender, 1 to 1 1/4 hours. Transfer to a serving dish. Whisk together lemon juice, capers, pepper, and remaining 1/2 teaspoon salt in a small bowl, then whisk in remaining 1/4 cup oil. Surround cauliflower with parsley sprigs and drizzle cauliflower and parsley with dressing.