- In a large pot of salted boiling water, cook the cauliflower until tender, about 6 to 8 minutes. Drain. Return to the pot.
- With the rack in the highest position, preheat the oven’s broiler.
- Add the sauce to the cauliflower. Adjust the seasoning and mix thoroughly.
- Spoon the mixture into two 500 ml (2 cups) baking dishes. Sprinkle with the cheese. Bake for 3 to 5 minutes or until the gratin is golden brown. Let rest at least 5 minutes before serving.
If you chose to freeze the gratin, bake it in a 180 °C (350 °F) preheated oven for 30 minutes. Finish cooking under the broiler for about 2 minutes.