Place the cauliflower, olives, garlic, rosemary, chili flakes, lemon zest, oil and vinegar on a baking sheet and toss to combine.
Roast for 15-20 minutes or until cauliflower is golden and crisp.
While the cauliflower is roasting, cook pasta according to directions.
Drain the pasta and return it to the pot. Add the cauliflower mixture and the lemon juice and toss to combine. Sprinkle with the pecorino before serving.