- Heat the oil in a large frying pan or wok. Add the onion and carrots and fry until the onions begin to soften.
- Add the mince and fry until it is no longer pink.
- Add the flour and mix well. Add the mushrooms, water, stock cubes, Worcestershire sauce and tomato puree. Bring to the boil, the sauce will thicken. Simmer gently for 10 minutes.
- Preheat the oven to 180ºC fan oven/200ºC/gas 6.
- Meanwhile put the potatoes and parsnips in boiling water, bring to the boil and simmer for 10 – 12 minutes, or until the potatoes are cooked. Drain and return to the pan, Mash with the butter and the Parmesan. Season well with salt and pepper.
- Pour the mince mixture into the bottom of a large casserole dish. Spread the potato mixture over the top. Place in the oven for 25 minutes, or until the top is nicely browned.