Winter may be dark and cold but it is good for one thing – root vegetables like parsnips, turnips and celeriac being in season. As well as this, these starchy vegetables pack a nutrient punch whilst at the same time satisfying our carb and comfort food cravings on dark Winter nights. This Winter Vegetable Gratin recipe works with pretty much any root vegetable so do feel free to experiment and find your favourite combination. I personally love the taste of celeriac (which is extremely low in calories but contains plenty of vitamin K which can boost bone health) and in this particular version I combined it with parsnips, squash and sweet potato – but carrots, potatoes, swede, fennel and turnip also work really well – if you have a favourite root vegetable now is the time to let it shine! This recipe makes a great side dish – I served it last night alongside steak for my husband and tuna steak for me, but it also works well with white meat. It was also delicious heated up again today for my lunch, so it works really well as a stand alone dish as well as an accompaniment. So how do you make it?