Place water and milk in a saucepan and bring to a boil. Add slowly wheat cereal. Cook for ten minutes and stir constantly.
Now add egg and salt. Beat well to mix and then pour into loaf-shaped pan to mould.
When firm turn out on the moulding board and cut into blocks. Place in a well-greased baking dish; sprinkle with grated cheese and dot tiny bits of butter.
Bake in a hot oven until the cheese forms a light brown crust. Serve with tomato sauce.