The ultimate comfort food recipe, Parsnip and Sweet Potato Gratin. Get cooking this cheesy side dish to serve with your Sunday roast or Christmas dinner. Root Vegetables cooked in a creamy mustard sauce with spinach then baked in the oven with a sprinkle of cheese.
Course: Side Dish, Vegetarian
Cuisine: British, French
Keyword: au gratin, christmas side dish, Dauphinoise, root vegetable, side dish for roast dinner, Xmas side