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Bring 6 quarts of water to a boil and add 2 tablespoons salt. Set up an ice bath next to the stovetop. Plunge the chicory into the boiling water and cook until wilted, about 3 minutes, then drain, and plunge into the ice bath. Drain again and squeeze out excess water.
In a medium mixing bowl, beat the eggs, add salt and pepper, to taste, and then add 2 tablespoons each of Parmigiano-Reggiano and caciocavallo. Mix well, then add the chicory.
Cut into six wedges and place each in a soup bowl. Bring the remaining chicken stock to a boil. Meanwhile, heat the olive oil to 325 degrees F in a tall-sided pot and add the bread cubes. Fry until they are golden brown on all sides and remove from the oil with a slotted spoon. Drain on paper towels, then distribute evenly among the bowls. Fill each bowl with a ladle of chicken stock, top with the remaining cheese, and serve.
Yield: 1 1/2 quarts