Meanwhile place the prepared turnip, carrots and parsnips into a large saucepan, cover with cold water and bring to a boil. Reduce the temperature and simmer for 20 minutes until tender. Drain and use a fork to mash the vegetables. Season.
Preheat an oven to 180oC / (Fan 160oC) / Gas markĀ
Spread the mashed vegetables over the meat. Sprinkle with cheddar cheese and bake in a hot oven for 20 minutes
Serve with seasonal steamed green vegetables