Gratins feature very heavily in french cooking. Essentially they include vegetables of some sort covered in a white sauce and popped under the grill. Most cultures have their form of vegetable gratin including a famous british cauliflower cheese. Creamy and comforting, this cauliflower gratin recipe features a classic bchamel sauce punched up by just a little bit of fresh thyme. This gratin is a classic at provencal tables and is often served for the traditional meatless christmas eve dinner, gros souper. Cooks note: this recipe makes extra bchamel sauce, which is perfect for drizzling on steamed vegetables.