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Heat the olive oil in a pot and sauté the diced onion until softened. Add the beef and pork mince, browning them well and breaking up any lumps with a wooden spoon.
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Pour in the white wine and allow the alcohol to evaporate. Stir in the salt, pepper, bay leaves, cloves, tomato concentrate, and ½ glass of water. Cook for about 30 minutes, or until the sauce thickens.
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Once the sauce has thickened, mix in the finely grated Parmigiano Reggiano and set the mixture aside to cool.
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Slice the cheese and the bread into pieces of the same size. This will help make the crumb coating process easier.
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Spread a generous tablespoon of the meat sauce onto each slice of bread, then top with a slice of cheese. Repeat for all the slices.
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Dip each bread slice into the lightly beaten egg whites.
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Coat them thoroughly with the flour and breadcrumb mixture.
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Heat vegetable oil in a pan and shallow fry the bread slices, cheese-side down first to prevent the cheese from melting completely. Once golden, remove and serve hot.