Finely chop the celery and onion and saute them in a large pan with 4 tablespoons of olive oil. Season with salt and when the mixture appears transparent, add the finely sliced ham and the mince meat. Mix and push it down with a wooden spoon and let it brown. Add salt and pepper, pour over wine and let it evaporate. Beat the eggs and pour into the mixture.

Transfer the meat into a bowl and pour 2 tablespoons of oil into the pan, add a clove of unpeeled garlic and the mushrooms previously cleaned and cut into slices, add salt and allow to cook until all their water has evaporated.

Remove the garlic clove and add to the meat mixture. Pour a little oil into a pan and the remaining garlic and sauté the finely chopped chard leaf and cook for 5 minutes

Add the chard to the meat & mushroom mixture and 3 tablespoons of cheese. Add to a food processor and briefly pulse and check the taste and add more salt & pepper if needed.

Heat the butter in a saucepan, add the flour and the milk. Add a pinch of salt, pepper and a little nutmeg. Add the grated cheese and a little grated black truffle.

Cook lasagne sheets for one minute, drain and let them cool in a bowl filled with cold water. Drain on a cloth you are looking for rectangular size 9 x 8 cm.

Spread the sheets on a clean dry tea towel and fill each with 2 tablespoons of filling. Wrap them to create the cannelloli shape and place them on a buttered baking sheet seam side down. Brush the top of the cannelloni with a beaten egg, cover with the béchamel sauce, add a few knobs of butter and a dusting of cheese. Cover the pan with foil and bake at 180 C for 30 minutes. remove the foil and raise the temperature to 200 C and allow the cannelloni to brown approximately 10 minutes.

Remove from the oven and grate the remaining black truffle over on the cannelloni, cover with foil. Leave for 5 minutes before serving.