Preheat the oven to 200 degrees. Rinse the quinoa and cook it in approximately fifteen minutes until done in plenty of water.
Cut the cauliflower into florets and toss them on a baking tray with a tablespoon of olive oil, cumin, salt and pepper. Roast the cauliflower golden brown in twenty-five minutes.
Sprinkle the turkey fillet with salt and pepper. Heat the remaining olive oil in a pan and cook the turkey in approximately ten minutes until done all over.
Spoon the quinoa onto a plate, place the roasted cauliflower next to it and the turkey on top. Squeeze some lemon over the dish and serve.