A continental meal vegetable clear soup of beans, carrots, spring onions and mushrooms. Cauliflower gratin is an easy side dish that you will surely love. This cheesy broccoli cauliflower recipe is delicious. Cauliflower Gratin cheesy, creamy and easy to make. The love for broccoli flower and the most famous Thanksgiving, Christmas and Easter recipe. It is so simple yet so full of flavor, the cheese sauce is the real star of the show.