Preheat the oven to 180°C.
Combine the cauliflower, tomatoes, and garlic in a dish that is suitable for the oven.
Mix the lemon zest and juice together and pour it over the vegetables.
Spray the vegetables with low calorie cooking spray so they are well coated.
Add a sprig of fresh rosemary.
Add some freshly ground black pepper and sprinkle with some sea salt.
Roast in the preheated oven for about an hour making sure to stir occasionally so that everything cooks evenly.
Stab the cauliflower stems with a fork to check they are cooked enough for you.
Garnish with crumbled up Greek style salad cheese and serve.