- 8 tablespoons (1 stick) unsalted butter
- 2 pounds yellow onions, peeled and thinly sliced
- Melt the butter in a large skillet over medium-high heat. Add the onions, reduce the heat to medium-low, and cook slowly, stirring occasionally, until golden brown and caramelized, 45 minutes to 1 hour. Remove from the heat and serve hot.