In a small pot, cover the farro with a couple inches water. Cover and bring to a boil. Salt the water and cook the farro until al dente, 23 to 25 minutes. Drain.
Meanwhile, in a large skillet, heat the EVOO, three turns of the pan, over medium-high. Cook the pancetta until lightly browned, then add the shallots and garlic; cook, stirring, 3 to 4 minutes. Stir in the kale to wilt, and season with pepper and a little nutmeg. Add the stock and lower the heat.
To serve, combine the farro with the greens. Stir in the lemon juice and hazelnuts, then adjust the salt, pepper and nutmeg.