Heat the oven to 200°C/Fan 180°C/Gas 5.
Parboil the potatoes for five minutes, drain and set aside. Wilt the cabbage, season well and stir in the ham hock.
Heat the cream, butter and garlic in a saucepan with a pinch of salt and pepper and set aside.
In a gratin dish, layer the potatoes, cheese, ham and cabbage, then finish with a layer of potatoes and a sprinkle of cheddar, Parmesan and parsley.
Bake in the oven for 25 minutes until golden on top. Serve immediately.