Melt a quarter of the butter in large saucepan. Fry
(sauté) the ham, onion and carrot for 3 minutes.
Add
the mushrooms and cook for 1 minute. Add the beef
and chicken livers and cook, stirring, until brown
and all the grains are separate.
Stir in the tomato
puree, wine, stock, sugar and a little salt and
pepper. Bring to the boil, reduce the heat and
simmer gently for 30 minutes until a rich sauce is
formed, stirring occasionally.
Meanwhile, blend the
milk with the flour in a saucepan. Add 25 g/2
tbsp of the remaining butter and the bay leaf. Bring
to the boil and cook for 2 minutes, stirring all the
time until thickened. Season to taste.
Discard the
bay leaf. Put a thin layer of the meat mixture in
the base of a large shallow ovenproof dish, greased
with the remaining butter.
Top with a layer of white
sauce, then a layer of lasagne sheets. Repeat the
layers until all the ingredients are used, finishing
with a layer of white sauce.
Sprinkle the top with
Parmesan and bake in the oven at 190°C/375°F/gas
mark 5 for 40 minutes until cooked through and
golden brown.