<human>:  What is the best way to caramelize onions?
<bot>: The best way to caramelize onions is to heat a pan over medium-high heat, add a few tablespoons of oil, and then add the sliced onions. Stir continuously and reduce heat to medium-low, continuing to stir until the onions become softened and golden brown. Sprinkle the onions with a pinch of sugar and keep stirring until the onions are deeply caramelized.