6 tablespoons extra-virgin olive oil
1/4 pound pancetta
5 large yellow onions
thinly sliced
1/4 cup fresh lemon juice
5 1/2 cups hot beef broth
= (fresh or low-sodium canned)
1/2 cup dry red wine
Fine sea salt
Grinding of coarse black pepper
4 slices coarse bread cut 1/2" thick
1 cup grated Parmigiano Reggiano cheese
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