500g field mushrooms (stalks removed) and 500g swiss brown mushrooms thinly sliced.
After sauteing the mushrooms, I added them to the large bowl containing the finely chopped porcini. I then chopped 60g prosciutto, 50g truffle paste and 3/4 cup of chopped flat leaf parsley. I then set the oven at 180C and turned my attention to the white sauce. The white sauce was made in two parts. In one pan add 750ml milk, 250ml cream, 1/2 cup of porcini liquid, 1 bay lead and 1/4 teaspoon nutmeg. Bring to almost a boil on medium heat. In another pan melt 100g butter and 100g plain flour. Cook until grainy. When both items are ready, gradually whisk the milk mixture in and it will soon thicken. Cook the sauce for another 5 minutes or until it thickens. Pour half the sauce into the mushroom mixture and reserve the rest.
Finally top with a lasagne sheet, the remaining white sauce and a layer of parmesan. Cook in the oven for an hour or until golden.
Cool for ten minutes before slicing and you can then tuck into your gorgeous piece of Lasagne Vincisgrassi.