Method

1. Pre-heat the oven to 200°C / 400°F / Gas Mark 6
2. Add the chopped tomatoes to a frying pan. If using tinned tomatoes add the juice as well
3. Add the mushrooms and onion to the tomatoes and simmer gently for 5 minutes
4. Sieve the flour into a bowl. Rub in the margarine
5. Add the milk and mix to a stiff ball. Roll into a large ball around ½ inch in thickness
6. Place on a greased tin
7. Spread the tomato mixture on the base and sprinkle cheese, onion and mushrooms on top
8. Bake in the pre-heated oven for around 30 minutes, or until the base is cooked with a golden colour