1/2 cup olive oil
1/4 pound pancetta or salt pork
5 large onions
6 cups Homemade Beef Broth
2 tablespoons grated Parmigiano-Reggiano cheese
Salt
Freshly-ground black pepper
4 slices Italian bread
2 teaspoons dry sherry
8 slices Swiss, Gruyere, or Provolone cheese
additional cheese grated, if desired
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