Meanwhile, in a large, heavy skillet, heat the oil over a medium flame. Add the pancetta and sauté until it begins to crisp, about 5 minutes. Add the garlic and sauté until pale golden, about 2 minutes. Using a slotted spoon, transfer the pancetta mixture to a large serving bowl. Add the Brussels sprouts to the same skillet and sauté until heated through and beginning to brown, about 5 minutes. Add the broth, ½ teaspoon of pepper, and ¼ teaspoon of salt, and simmer until the broth reduces just enough to coat the Brussels sprouts, about 3 minutes.