Place a rack in lowest position of oven; preheat to 450°. Whisk pepper1 and ¼ cup oil½ cup in a large bowl to combine. Add cauliflower1, season with salt, and toss to coat. Spread out cauliflower in a single layer on a rimmed baking sheet and roast until dark brown and crisp underneath, 15–20 minutes. Remove from oven and turn cauliflower over. Roast until second side is dark brown and crisp, 10–15 minutes.