Step 1
Put the onions in a large skillet over medium heat. Cover and cook, stirring infrequently, until the onions are dry and almost sticking to the pan, about 20 minutes. Stir in 2 tablespoons of the oil and a large pinch of salt and turn the heat down to medium-low. Cook, stirring occasionally and adding just enough additional oil to keep them from sticking without getting greasy. The onions are ready when they’re dark, sweet and jammy, 40 minutes to 1 hour later.