Preheat the oven to 400 degrees Fahrenheit. Slice the tops and tips from the radishes and cut them in half. Quarter the onion half. Arrange the cauliflower florets, onion and radishes across a shallow oven tray. Drizzle over 2 tablespoons of olive oil, half the lemon juice, and sprinkle over the garlic powder, salt and pepper. Use your hands to coat the vegetables in the oil and seasonings. Transfer to the oven and roast for 20 minutes or until the vegetables are tender and golden.
Step 2
While the vegetables are cooking, cut the halloumi into 8 even-sized portions. Heat a large dry non-stick skillet over a medium heat. Add the halloumi pieces. Cook for 2 minutes until browned on one side. Turn and cook for 2-3 minutes on the second side until golden.
Step 3
Add the remaining olive oil and lemon juice to a small bowl. Whisk together well to combine. You may add more or less lemon as desired. You may also season if preferred, but the halloumi itself will be very salty.
Step 4
Add the halloumi to a large serving bowl along with the roasted vegetables. Roughly chop the mint and scatter over the salad. Drizzle over the lemon oil and gently toss to combine. Serve warm.