1. Preheat oven to 450°.
2. Combine cauliflower and 1 tablespoon oil on a jelly-roll pan, tossing to coat. Bake at 450° for 30 minutes or until browned, turning once.
3. Combine remaining 3 tablespoons oil, lemon rind, and next 4 ingredients (through black pepper) in a large bowl; stir with a whisk. Add roasted cauliflower, caperberries, parsley, and capers to bowl; toss mixture well to combine.