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Moisten the bread with hot broth and then squeeze out the broth using a cheesecloth. Finely chop the prosciutto. Pound the beef marrow with the flat part of the knife and then use the knife to knead it until it is reduced to a paste. Combine these three ingredients with the Parmesan, and then add the eggs.
Spread the mixture on a pastry board sprinkled with flour. Then cover with more f